Doepfer

Thanks for your comments.

There are many different Theremins nowadays... Some of them might 
actually produce sine wave. However, the musically more useful 
(including the original Theremin) instruments don't. The reason for 
this is explained here:

http://www.paia.com/ProdArticles/thereton.htm
"As coupling increases, the two [high frequency] oscillators try to 
pull one another to a common frequency resulting in distortion that 
produces an output rich in harmonics at integral multiples of the 
difference frequency. The waveform may be saw-like or pulse-like 
depending on phase of harmonics..."

It is more complex and musical than (say) a sine wave fed to a tube 
amp. 

Propably, if the sound of Theremin - or especially Ondes Martenot - 
could be done really well with standard synth techniques, we would 
have heard it already... I am skeptical though. At least, I think 
filtering a standard oscillator isn't enough.

How good is Ondes Martenot sound? It is like a Hammond or Rhodes. You 
can play it whole your life! Personally, I can't say that about any 
synth sound I have come across. If you are interested, please listen 
those Ondes Martenot sound examples I linked in my first post. If 
someone can make that kind of sounds with any synthesizer, I would 
like to hear! - I am soon getting my French Connection...
  

Best regards
Jari Jokinen