From Lydia Kavina:
Very important that a good theremin engineer should be a good theremin player.
Theremin can be sensitive to the size of the person, it affects the tuning of an instrument.
Stability important - different voices, imitating other instruments and singing voices, and original theremin voice. These may be needed to be tailored to different ways of playing.
Thierry, developer of Open Theremin
Many theremin circuits published in electronic magazines, and forums, many are well thought from point of view of engineer, but are useless for a musician.
We have a more limited market than a violin, which is available in many sizes. So for Theremin, a modular approach is appropriate
Eric Holloway is developer of D—Lev, and FPGA solution for Theremin.
He started on Theremin world 10 years, and has been working on it for 8 years, but very heavily for 4 years.
Built 10 kits perhaps, and several prototypes. Is having trouble to find the FPGA board that he uses, and the price has increased.
Very little analog in the D-lev. Doing everything numerically, and he hit on a very linear solution.
Jeff demonstrated Silent Night played on D-Lev during Lydia Kavina Christmas Party on 2021/12/26
Discussing Design of D-Lev