Here's an example of how to play the Theremini rather like a synth using MIDI CC102 (transposition). Set a fixed tone on the Theremini with a mic stand or some other object (a steady hand will waver too much). Then in a sequencer create a melody (doesn't matter what the pitches are as pitch will be totally controlled by transposition as there is no MIDI Note processing). Finally go into the sequencer and change CC102 mapping to each note to the desired semitone value which will alter the fixed tone as needed to to create your melody. The transposition function supports -64 to +63 semitones so MIDI value 0 = -64, etc. Then pick a MIDI value for the base transposition center of your piece (starting pitch based on actual pitch played on Theremini) and offset from there. I start around CC102=64 for the base pitch and offset from there but you can change this depending on the overall range you want to use.
Once you have this set up, you can then play a tune by varying the transpositions in the desired rhythm of your piece and it will alter that fixed Theremini output tone accordingly.
https://soundcloud.com/rk53-1/playing-t ... elude-in-g
or even better experiment by modulating the tune in various ways by playing the theremini as the desired transposition pattern is played back on the MIDI port.
https://soundcloud.com/rk53-1/theremini ... dic-effect
Just be aware you can not play repeated notes this way. If you successively change CC102 to say 45 for four notes in a row, you really have not changed the transposition and remember there is a fixed tone playing on the Theremini, so this is just going to give you a held note. To get repeated notes, you have to also alter volume to go to 0 for the repeated notes and then bring that back up for the next note. Have not played to much with that (you'll notice in the Bach example notes that should be repeated are held because I did not use this trick). Of course in your piece, you'll have to start by zeroing CC7 and bring that up when your actual playing begins (as there is a fixed tone coming out of that Theremini at all times with this method). So alter CC7 or one of the other Theremini volume CCs as you need to.
Rich