[sdiy] Mixing between two audio-sources..

[np]

Hi guys..

I'm looking for a way to mix two different audio signals. In the end 
it's going to be a voltage controlled dry/wet
control for an effect loop.

The SSM2024 datasheet has something like that. However, I'm a bit unsure 
if this circuit isn't oversimplified. I'd like to have equal volume over 
the whole sweep-range for the cases where the two audio signals are 
identical.

Any idea how to do this?

Cheers,
  Nils