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  • Theremin World - Luna
    Videos Films Sounds and Audio Links Tech Schematics RCA Theremin Tech Keppinger Theremins Mods Software Resources for Builders Store Theremins and Kits Theremin Buyers Guide Recommended Effects Theremin Music Theremin Method Books Theremin Apps Accessories Theremin Books Logo Gear Auctions Forums Recent Posts Most Popular Topics All Forums search search Luna About Location Cleveland Ohio Theremins Burns B3 Activity Joined Dec 21 2014 Last Seen Nov 23 2015 Forum Posts

    Original URL path: http://www.thereminworld.com/user/luna (2016-02-12)
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  • Theremin World - Topic: Let's Design and Build a (mostly) Digital Theremin!
    the digital section EDIT Oh I see you are talking about tone spacing in terms of how wide the octaves per hand movement are No provision for changing that yet though the zero calibration can be performed closer or farther from the antenna but this profoundly affects linearity as it does on a conventional analog Theremin You should consider cooperating with one ore more professional theremin players of all techniques and styles and meet them often with your prototypes during theremin workshops and conventions Only after the majority of them approved your circuit you could present it to the grand public in order to prevent deception on both sides yours and your future clients Yes I have been considering this but for now am relying on my own musical instincts link Report Post Posted 5 12 2012 9 58 30 PM 4 dewster From Northern NJ USA Joined 2 17 2012 threads posts On the tuner I can see and of course I can also hear around 10 octaves but only about 8 or so are linear and a couple of these are in the subsonic region I m curious do most Thereminist here consider open hand close fist octaves too tightly spaced For the left hand I m thinking up down for volume and in out closer farther from the player s body for timbre of some sort For that I d need a double sensor for the left hand and capacitance mixing antennas And I know I shouldn t but I still want to have the left hand physically anchored somehow it would make the playing of the pitch side so much easier and more intuitive Christopher I agree that voice selection is critical am aiming for something like human at least at first I must say that your enthusiasm is infectious and your insights most inspiring why are you winding your building efforts down link Report Post Posted 5 13 2012 7 13 55 PM 5 dewster From Northern NJ USA Joined 2 17 2012 threads posts I posted a quick YouTube video showing the basic linearity http www youtube com watch v orvBeJnIxCI Comments here and or there are welcome link Report Post Posted 5 13 2012 7 31 28 PM 6 FredM From Eastleigh Hampshire U K Fred Mundell Electronics Engineer Primarily Analogue CV Synths 1974 1980 Theremin developer 2007 to present soon to be Developing Trading as WaveCrafter com Joined 12 7 2007 threads posts I am replying to your post from your YAEWSBM thread this seems like a more appropriate place You say The waveform could be changed on a per sampling clock period or even faster the beauty of doing this in logic rather than software Yes doing this in software would be a problem However I do not really understand how doing this is possible even with logic Discussing the issue of quantizing you stated on the YAEWSBM thread Any resolution is possible if the low pass filter can be set low enough but response time suffers if it is set too low so there is a tradeoff And from this it would seem impossible to update the audio waveform on a per sampling clock period It seems to me that any latency inherent in computing filtering the input capacitance value must be the minimum possible update time The above probably doesn t matter one iota if the reading update rate or filter TC is not too long and if this latency is constant a couple IMO up to a maximum of 10ms of ms latency IF this latency is constant and if one then updates the audio wave shape at a frequency 20kHz you should I think be able to emulate a mixed signal theremin adequately If you get the sensing accurate enough and fast enough you should theoretically be able to emulate any theremin and create theremins which have not existed before You have a numeric value which you can do whatever you want with control digital oscillators and filters cause the harmonic content to vary with pitch in a way which can emulate oscillator syncing whatever you want One day someone will achieve this I wish you all the best If I was investing time money into a FPGA CPLD DSP based theremin I think I would be looking at producing a unit which concentrated on rapid acquisition of position and which from this computed the log of the acquired data to give an adjustable linearity correction and output this as a 1V octave CV It is easy to make any theremin voltage controlled yes it is and it is easy to set registers change the range number of octaves spanned I am not trying to persuade you to change direction Don t I have been switching direction continuously in my theremin developments and this is probably the main reason Im broke But if while playing with your FPGA you see an easy way to provide a linearized CV let me know I believe the future is a hybrid Front end which deals with the linearity and stability issues and allows control of range etc and this to be followed by conventional or unconventional heterodyning analogue mixed signal theremin which is liberated from the constraints imposed by the antenna and its circuitry Fred link Report Post Posted 5 13 2012 8 10 59 PM 7 dewster From Northern NJ USA Joined 2 17 2012 threads posts Thank you for your thoughtful comments Fred and thank you also for addressing them here where it is more germane If I was investing time money into a FPGA CPLD DSP based theremin I think I would be looking at producing a unit which concentrated on rapid acquisition of position and which from this computed the log of the acquired data to give an adjustable linearity correction and output this as a 1V octave CV I agree entirely with the rapid acquisition part This is why I spent about a month doing

    Original URL path: http://www.thereminworld.com/Forums/T/28554/lets-design-and-build-a-mostly-digital-theremin (2016-02-12)
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  • Theremin World - Topic: Moog Theremini!
    Posted 1 23 2014 3 55 35 PM 5 Chobbs From Brooklyn NY Joined 12 1 2009 threads posts Guys you gotta look at the positives like having a built in kensington lock slot Finally someone is listening to the demands of musicians link Report Post Posted 1 23 2014 5 18 30 PM 6 Detlev From Annaberg Buchholz Germany Joined 10 29 2012 threads posts I m looking forward to watching the thousands of new youtube videos link Report Post Posted 1 23 2014 6 00 34 PM 7 dewster From Northern NJ USA Joined 2 17 2012 threads posts Interesting The tuner looks like it gives you the note letter and offset I don t think this is very intuitive and an LCD probably isn t fast enough for a real time tuner display The feet like on the EWS imply you can just set it on a table or something and play it I wonder if this is possible like it isn t on the EWS I m kinda partial to internal speakers even if they sound like crap because it reduces the fiddling around for casual use Variable strength pitch correction is probably the most interesting thing in the feature list Looks like a big cross on the bottom reflecting off the table it s sitting on I wonder what that is I think it s storage for the antenna Built in 3 8 Mic stand and Camera stand adaptor I think maybe a camera tripod might be a better stand then a mic stand User selectable range highest note and lowest note stored per preset Hmm adjustable sensitivity link Report Post Posted 1 23 2014 7 09 30 PM 8 Thierry From Colmar France Joined 12 31 2007 threads posts I guess it s not adjustable RF sensitivity but just the conversion ratio between whatever capacitive sensing and the audio pitch frequency link Report Post Posted 1 23 2014 8 20 11 PM 9 GordonC From Croxley Green Hertfordshire UK Joined 10 5 2005 threads posts I think maybe a camera tripod might be a better stand then a mic stand Camera tripods are designed to keep the thing they are supporting from wobbling which is good OTOH the connecting bolt is a lot smaller than a nice big chunky mic stand attachment which I m not keen on and they look terrible on stage link Report Post Posted 1 23 2014 8 39 54 PM 10 FredM From Eastleigh Hampshire U K Fred Mundell Electronics Engineer Primarily Analogue CV Synths 1974 1980 Theremin developer 2007 to present soon to be Developing Trading as WaveCrafter com Joined 12 7 2007 threads posts I felt that all of my hard years of intense practice were suddenly gone into nothingness It pi ed me off still does Amey I have heard this reaction many times to suggestions about making the theremin easier to play or ideas like I had have of On Key Emphasis which makes the

    Original URL path: http://www.thereminworld.com/Forums/T/29283/moog-theremini (2016-02-12)
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  • Theremin World - ErMan
    RCA Theremin Tech Keppinger Theremins Mods Software Resources for Builders Store Theremins and Kits Theremin Buyers Guide Recommended Effects Theremin Music Theremin Method Books Theremin Apps Accessories Theremin Books Logo Gear Auctions Forums Recent Posts Most Popular Topics All Forums search search ErMan About Website http www facebook com TimelessSonicFactory Location Rome Italy Theremins Moog Etherwave PRO Big Briar Etherwave Subscope Voicematic V3 Twitter ermanlab Activity Joined Jul 1 2012

    Original URL path: http://www.thereminworld.com/user/ErMan (2016-02-12)
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  • Theremin World - Topic: My New Year gift to TW: A new theremin circuit
    it seemst to work A couple of issues worry me a bit First is the DC current through the inductor this could be a few mA easily so selection of the inductor may not just be simple 1mH fixed inductors which are not critical as long as their self resonant frequency is above 800kHz the ferrite core of the inductor and its BH as well as thermal charactaristics could will affect performance Then I am not sure about its start up performance particularly with the R11 C11 R41 C41 slugging effect Not having played with this oscillator ever at all what I say is pure first gut feeling but I would imagine that start up would be better secured by a fast V transient at the top of the inductor than from a slugged supply oh I do understand why you need to do this to isolate supplies and I may be completely wrong about my analysis Going back to the DC current It may well be possible to use this for tuning by making R12 somewhat variable say a 500R variable resistor in series with R12 But whatever care must be taken in selection of an oscillators inductor when there is any significant DC current through it I wont be adopting this oscillator IMO Dewster s series LC CMOS oscillator guarantees start up and and also provides higher antenna voltage and with series LC there is no DC through the inductor And a 74HCU04 or similar is easily obtainable and probably costs less than a 2N5484 Fred link Report Post Posted 12 28 2013 11 45 20 PM 6 Thierry From Colmar France Joined 12 31 2007 threads posts Fred that s most probably a question of difference between theory and practice The average DC through the inductors is only about 1 3mA each measured Thermal drift is not a problem under these conditions because both inductors will create about the same drift which will finally be eliminated by subtraction in the mixer I never saw any startup problems on the about 60 circuits which have already been built by amateurs during workshops or as school projects and professionals like Wilco or me The time constant of the R11 C11 network is small enough to allow sufficient self induction in L11 during power up It was my design decision to keep the DC operation points of the oscillators fixed and opting for a mechanical tuning because this would eliminate the risk of startup problems and keep the oscillators amplitudes constant which guarantees a stable output waveform and level In ever case this design is not for you It s for beginners who want to do a little soldering and have a nice audible and playable result which works for sure and at low cost I have also some more complex designs among others with DC free inductors and higher antenna voltages in the drawer but everything depends on the specific requirements When people ask for a VW it makes

    Original URL path: http://www.thereminworld.com/Forums/T/29231/my-new-year-gift-to-tw-a-new-theremin-circuit (2016-02-12)
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  • Theremin World - sparkmaster
    Sounds and Audio Links Tech Schematics RCA Theremin Tech Keppinger Theremins Mods Software Resources for Builders Store Theremins and Kits Theremin Buyers Guide Recommended Effects Theremin Music Theremin Method Books Theremin Apps Accessories Theremin Books Logo Gear Auctions Forums Recent Posts Most Popular Topics All Forums search search sparkmaster About Location Atlanta Georgia Theremins am building first one now Activity Joined Dec 28 2015 Last Seen Dec 29 2015 Forum

    Original URL path: http://www.thereminworld.com/user/sparkmaster (2016-02-12)
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  • Theremin World - Topic: Moog Music Theremini Reviews
    control to trim the resulting value Their goal will naturally be to reduce complexity because this instrument is after all supposed to be easier to play According to Steve Dunnington the solution for the calibration issue will involve a 3 second timer with some message on the instrument s LCD instructing the player to stand in the appropriate low pitch position after the timer has been engaged While this solution may work it is very time consuming very inconvenient and it offers very little in the way of quick precision adjustment Note Range The note range is all handled within the setup Any note range according to MIDI note values can be selected using the same setup process The high and low MIDI note values are each set and saved independently This means pitch interval spacing is dictated by three variables playable note range space control zone size and to some degree the position of the player s body as it would be with a normal theremin This makes tuning the instrument with an interval spacing approach highly complicated Turning a single knob and adjusting body position is clearly a more simple process than the Theremini s four independent digitally controlled threshold parameters to create the desired field spacing and note range In my opinion this is not a good method at all but it seems the new architecture requires the various parameters to be set independently If there was some way that an alternate simplified setup could be achieved by only turning one knob I hope it is included in the final design My impression of the tuning method There are two tuning approaches that need to be clearly identified one is a tuning method that sets a custom note range to a custom physical playing arc in the case of the Theremini The other method is a tuning of the overall space according to a fixed note range zero beat to upper limit as is the case with traditional theremins The setup process for any theremin must not be a challenging process I am sure that Moog Music totally understands this but we ll have to wait and see if they can offer an easier tuning method than what was shown in the prototype Turning one knob to adjust everything about the pitch range in one go would be the easiest method With a bit of automation and programming it could be done in the Theremini but it does depend on whether or not the Moog Music firmware engineers are aware of the possibility The USB firmware update upgrade system could prove to be the most valuable asset of the theremini down the road It would leave the door open for future revisions to what ever needs fixing The Theremini prototype s current setup procedure for tuning of the space for consistent interval spacing and playability is IMO way too broken and complicated I do understand that I am in a rare minority of theremin players in the world with actual requirements of their precision engineered instruments and I also understand this Theremini instrument was not made just for me But I also know that the theremin can in fact be engineered to be easier to play not by including features like pitch quantization but more importantly by making improvements in the tuning calibration process and linearization of the pitch field and by allowing adjustments in the volume field Even with the currently complicated tuning method of the Theremini it is likely many people will continue to believe the theremin is impossible to play without pitch correction and will accept what ever tuning method they are given My perspectives and opinions of the tuning process are meant for theremin playing without pitch quantization When the feature is turned on very little of this dissertation will matter to persons who wish to carelessly wave their hands to produce fantastic new sounds About the Moog Music booth Theremini demo area The trade event environment was a very non ideal environment to properly evaluate a theremin The design of the demo area which made it very easy for people to try out the theremins at the booth created a very non ideal playing environment that essentially eliminated any possibility to properly gauge the linearity of the instrument s pitch spacing The demo area was a horizontal 2 by 4 wood frame in a zig zag shape which seems to offer a little more space between the instruments The theremini units were mounted on posts with mic adapters that allowed them to be freely rotated to be played from the interior of the booth and exterior walking traffic side of the booth This was an excellent choice for the show I think it was the most user friendly theremin demo display that has ever been created Because the Thereminis could be approached from inside or outside the booth it seemed to make the booth design cosy and inviting Linearity Because the instrument is an early prototype It doesn t make sense to scrutinize the linearity of the pitch interaction of the Theremini In general I did not get the feeling that the interval spacings decreased near the highest and lowest extremities in the range It is possible that there is not any analog linearization technique being used at all but I am not certain That will be a good question for Moog Music Linearization of the highest and lowest octaves of the range could be handled in the analog domain which was the case for the Etherwave Pro but the new hybrid architecture now opens up the possibility for linearization to be handled in the digital domain I am biased towards the techniques implemented in the Etherwave Pro because of my experience with the E Pro and being able to obtain a satisfactory linear playing interaction with it Many thereminists have different concept of how consistent their tone spacing must be It varies so much from player to player that IMO the topic does not make sense to explore in great depth for the Theremini prototype I personally have some very high standards that need to be met before I can totally approve an instrument but I feel it s just too early to rate this aspect of the Theremini The changing external environmental variables at the NAMM show booth made it impossible to test accurately in the first place Theremin Wavetable sound engine The Theremini s tone is achieved by wavetable synthesis and processing is handled completely in the digital domain at this point The new sound engine offers future possibilities in the modulation of waveforms over time à la Animoog s sound engine as well as new timbre modulation possibilities when used with the continuous data values derived from the expression and pitch antennas hopefully in the future after the hardware has been finalized Updates and revisions to the feature set of the Theremini will be achieved through the USB port using some software update application Moog Music will release The software extensions of some of their recent synths have been very impressive opening up many under the hood features of their synth products so I would imagine there would be some great surprises down the road for Theremini upgradability Pro Option Kit Upgrade details There will be a pro upgrade option for the Theremini It will consist of additional CV outputs gate CV and volume CV via some kind of breakout cable so that the three voltages come out of a single 1 4 inch jack As I understand the pro upgrade will also offer better analog oscillator circuitry than the base model The Pitch antenna will be longer The Volume antenna will be bigger and very possibly a different shape There may also be the inclusion of more customization to enhance playability beyond what is improved upon by the adding the pro antennas I was told the features of the base model of the Theremini were selected based on cost This is the reason for the Pitch CV being the only CV output Pitch Quantization When some of the 32 presets were dialed up the tones had pitch quantization pitch correction automatically enabled This means a default pitch Bias value is stored within each preset At any time however the Pitch bias knob could be rotated to disable or modify the stored value Moog Music has chosen to use the label of pitch correction but I think they may not use that wording down the road when the product is finally shipping The feature is technically pitch quantization They have labeled the degree of snappiness of the quantization as pitch bias The feeling of the quantization in my pitch hand did varied according to the bias amount There is a snapping of the audible pitch to its closest frequency value which basically allows a person to not have to be absolutely still in order to hold a note steady The note being sustained is however cold in my opinion because vibrato could not be added to the pitch that was engaged regardless of what the Bias amount was set to This is contrary to what Steve Dunnington mentioned in a couple of demo videos I did not feel there was any possibility for creating vibrato when selecting any pitch bias amount Only when pitch quantization was completely disabled was I able to create vibrato I think the Pitch Bias is factoring in to the quantization as some combination of time component and margin of error offset which allows fast sweeps to occur without quantization at lower bias values Firmware Upgrading and MIDI connectivity The USB connection is going to offer some great upgrade possibilities over the lifespan of the instrument We can look forward to many new possibilities in the future user customizable waveforms preset configuration MIDI input as a modulation source MIDI sequenced playback of a live theremin performance possibly editing i o and other capabilities comparable to the Animoog iOS application At this time Moog Music has said the USB port will allow access to a continuous data from the pitch and volume data streams but that it will be in the form of a MIDI CC message It s unclear at this time if the interface will offer MIDI Note on off messages that correlate to the quantized pitch output of the theremin signal Details are not available yet about the sampling resolution in the audio signal to MIDI conversion process but the system uses some form of microcontroller with a frequency counter to continuously derive the pitch data For the past three years I ve been working on my own analog pitch to digital data conversion processes so I am naturally curious about what ever technique was used Visual Feedback Tuner Display For reason I am still unaware of there is a slight delay in update of pitch information in the LCD display It is not actually updating in real time as the currently release product specifications have implied It may be an acceptable rate of update for people wanting to locate a note from silence typical of any digital tuner but I would not rely on it for quick visual feedback unless the refresh rate and latency was improved significantly for the final build The display is a low resolution dot matrix LCD Pixels are only able to be either on off This presents some challenges from a user experience point of view such as jumpy animation and inaccurately depicted visualizations Amos Gaynes told me they are aware of the limitations in the display hardware and that they will sort through these and other issues once the product finally ships or in future firmware revisions Some more inconspicuous detail The pitch antenna does not have threads it is installed by inserting directly into the housing Four prongs on the inside hold it very firmly in place When the instrument housing is in it s final state there will be clips on the bottom of the instrument to place the antenna for easy storage The Theremini prototype could only be grounded using an external powered amplifier or the ground screw found on the leftmost end of the back panel The line level output amount is adjustable via the setup interface it is set up independently of the main volume knob control which only affects the built in speaker and headphone output level The speaker is disabled when headphones are plugged in Theremin instrument stand mount The instrument mount was said to be a camera tripod mount At the show the demo units appeared to be on some kind of rotating microphone stand adapter It is likely that the mounting mechanism that ships with the instrument should come with appropriate adapters depending on region This is a good question for the future I did not ask At the show the whole Theremini instrument seemed very clumsy and wobbly when buttons were being pressed and knobs were being turned At this point it s fair to say that the instability was owed to what ever mounting solution Moog Music came up with for the show and not because of the Theremini unit itself Comments about the tone presets I don t have much to say about the various presets other than they sound very comparable to the sounds that can be produced in the Animoog iOS app The presets on the Theremini contained varying scales note ranges and root notes in addition to the timbers waveforms I think it should not be in the final build however because altering the scale range and roots would drastically affect playability and consistency of note spacing and overall playability Moog Music is aware of this but it made good sense for the demo units at the show to present booth visitors with the widest assortment of sonic possibilities in different ranges Playability with the pitch quantization feature turned off When the pitch quantization feature is disabled the Theremini does actually feel like a real theremin My personal preference is for the control interaction to be the highest priority the tone being second and output options last If the theremin does not feel like the traditional interaction then I will not care about the sonic possibilities When I first tested the volume response it felt slow meaning I was not able to produce a variety of articulations Many thereminists would understand if I used the term molasses which Clara first used to describe the volume response of her custom built RCA Based on my experience with various theremins I am certain that the design of the Theremini volume antenna is responsible for the slacken response As for pitch I am certain the Theremini can be adjusted to obtain a satisfactory pitch field interaction The current Theremin Tuning process a player s understanding of capacitance and the player s awareness of their body stillness would be the first major obstacles That could be said for all theremins When the pitch quantization is disabled I must say Theremini does NOT feel terrible It feels okay It is very important to not judge playability based on what was presented in any NAMM demo video The people demonstrating the instrument are not skilled theremin players If a 2 year old child is unable to extract the full musical potential from a concert grand piano the concert grand piano should not be automatically judged as a toy The Built in Delay Effect There s not much that can be added to elaborate on this feature It is pretty straight forward It serves a specific effects oriented theremin player It is very convenient to have the option of quickly engaging the effect and length The delay duration type and amount values seemed to be stored along with some presets I am not entirely sure because I did not explore this detail extensively but the delay may operate independently from any presets It can definitely be disabled and enabled very easily at the push of a button The instrument housing design The chassis was architected by industrial designer Axel Hartmann He is a well known designer in the synthesizer ID circuit A search of his name on google should return enough detail I personally do not like the design very much because of its plastic housing and shape but it was easy to arrive to that opinion because we arrived here from the beautiful wooden housings of the past When I talked with Amos Gaynes about the housing he told me that there is nothing in the design that would absolutely require the plastic housing Anyone skilled in instrument cabinet making could design a new housing and move the circuitry without any unforeseeable complications COMMENTS INSPIRED BY THEREMINWORLD Theremini s feet The table top feet and table supports of the Etherwaves from the past have always been intended for convenience Anyone who is aware of the influence that a table has on the pitch volume antenna fields will not choose to place the theremin on a table The inclusion of the feet prove this Also for example the Etherwave Pro a professional performance theremin was never meant to be placed on a table The RCA style cabinets were of course supported by their own cabinet mounts Placing anything near the antennas affects the performance of the instrument but it is possible that people placing their Theremini on a table will not care Lessening the difficulty by including quantization Not everyone at Moog Music who is working on this instrument is approaching the instrument from the point of view of making the theremin an easier to play instrument Two Moog Music people I spoke with have agreed that nothing not even pitch correction will make the instrument easier to play The pitch quantization is a feature that opens the door for potential theremin players to understand the space control concept quicker that there does in fact exist notes that a player can locate in the space between his

    Original URL path: http://www.thereminworld.com/Forums/T/29392/moog-music-theremini-reviews (2016-02-12)
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  • Theremin World - randy george
    Guide Recommended Effects Theremin Music Theremin Method Books Theremin Apps Accessories Theremin Books Logo Gear Auctions Forums Recent Posts Most Popular Topics All Forums search search randy george I ve been a theremin musician since 2006 when I first discovered the instrument I love the theremin so much It changed my entire life and continues to influence my life to this day most often in unexpected ways I ve shared a small number of theremin creations on the internet that I have made over the past years My goal is to take what exists in the world and use it to inspire other people to do the same Creativity reciprocates creativity infinitely I think one of the most valuable qualities of a developing theremin player is the ability to discard techniques that were previously learned in order to do things in a new way if the player discovers that the old ways don t work as effectively as possible It takes a lot of courage to create a new foundation because it means losing a sense of stability that may have been established over years of practice Awareness is the key About Website http randygeorgemusic com Location Los Angeles California

    Original URL path: http://www.thereminworld.com/user/Randy%20George (2016-02-12)
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