Dave H here. 
First I have really been impressed with the information available here at Theremin World. 
I am located in Sedona, AZ. 
My background is in both hardware and software design. 
I ran my own business for over 20 years developing new electronic products for various industries including medical, education, toys, and consumer electronics. Often setting up production in mainland China. 
I was first exposed to electronics at age 7 and just couldn’t get enough building of Heathkit projects. I built my first simple theremin when I was 14 years old. Just a builder back than not much of a player. 
I have just started learning to play an Etherwave plus. My experience playing violin seems to really help. Today I just received a second Etherwave Plus which I am modifying for me, a left handed player. Tuning a Theremin while it is switched around backwards is kind of a pain. I would love to get my hands on  a Etherwave Pro, wouldn’t everyone. Have a Wavefront Classic on order, left handed version. 
I have been reading the threads here for a couple of months. Looking at schematics,  reading about methods of playing and general information gathering. 
I spend part of each day watching various Youtube videos or watching DVDs about Theremins. (Theremin an electronic odyssey.) Between research and playing practice I spend about 6 - 8 hours a day on Theremin related topics. 
(Old habits die hard.)