[sdiy] Mixing between two audio-sources..

[Scott Nordlund]

Crossfading uncorrelated signals should be done exponentially to have equal power over the whole range (like a dual ganged log/antilog potentiometer), which the circuit in the SSM datasheet seems to do. From your description, you seem to want a linear crossfade (though I'm not sure which is really best for a wet/dry control- I suppose it would depend on the effect).  I'd guess the easiest thing to do is just invert and offset the CV for one of the VCAs, carefully adjusting the offset so that it works over the desired range.

----------------------------------------
> Date: Sat, 18 Apr 2009 21:44:12 +0200
> From: np at planetarc.de
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Mixing between two audio-sources..
>
> 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
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Rediscover Hotmail®: Now available on your iPhone or BlackBerry
http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Mobile2_042009