[sdiy] Xfade

[peter edwards]

I'm having a hard time finding crossfader schematics. Anyone out there 
have any schematics or resource suggestions?
I want a true RMS crossfade with a -3dB midpoint.I will be fading 
between two synth level signals (around 10V pk-pk).
The catch is that I would like to achieve this without using a dual 
ganged pot and without making the circuit overly complicated (like 
basing it on two VCAs). I have a feeling these two requirements may be 
mutually exclusive.
Any ideas??
Thanks!
-Pete