Doepfer

Hello

It seems that the highest frequency of the A-110 lies around 
1200 Hertz, while the A-121 set to self-oscillation can produce 
frequencies up to 14000 Hertz. 
Is this correct?

Is it possible to produce sine waves of approximately 18000 
Hertz with the A-100?
I've tried patching the same signal (from A-121) into both Ring 
Mod inputs, hoping I could simply double the frequency that way, 
but this doesn't seem to work.

And does anybody know where I could get one of those separate 
Belton reverb units used for the A-199?

Many thanks for help.

MD