Blend 2 wet + 1 dry

[xman]

Hi, I'm looking for a way to blend two wet signals and one dry.

I have a long effects chain, with a buffer at the beginning and another one in the middle... at the end there are two delays (ibanez de-7).

From the two delay I take only the wet signal, while the dry is before the first delay.

So at the end of the chain I have 3 signals: wet delay 1, wet delay 2, dry

How can I blend this 3 signals into a mono output?

(I use it also for stereo output: I blend only the wet signals for a channel, and dry to the other channel)

[psychedelicfish]

One blend control would be difficult and probably not worth the effort. You could, however, have a volume control type pot feeding into a buffer for each input, connecting the outputs of the buffers together.

[xman]

for me would be fine also a "simple" mix (sum) of all three signals ... without any control

[xman]

something like the GGG mini mixer would be fine ?
http://www.generalguitargadgets.com/pdf/ggg_mixer_sc.pdf

or even the AMZ simple mixer ?
http://www.muzique.com/schem/mixer.gif

[blackieNYC]

Just built one. Works on the bread board, stuffing a perf board now. Avoid FETs.  With a 9 volt there was distortion. Use the AMZ simple mixer ( with a 1 meg pot in the feedback loop as a master gain). I'll draw a schematic for you later today. The splitter is an input op amp(I used 2 dB gain) split out to three op amps configured as RG Keens polarity reverser.  They will also function as buffers for each send.  Treat the dry that same way, as if the send and return for this third channel were wired together.  You'll need the polarity inverter not just for out of phase loops, but you might end up with an odd number of inverting stages in this box.  The two sends go out, the returns and the dry come back into 10k pots, a series cap, 100k series resistors for each which sum together into the summing op amp. I followed this with another op amp to do an eq'd or flat boost.   The pots have kill switches to ground across them, to turn each of the three channels on and off.
I don't recal what I used for the input buffer driving the three inverters. The Klon buffer would work.  I think mine is the DOD250 input buffer with the cap in series with the 4.7k to ground upped to 1 uF.  The dod was designed to roll off bass.  This will not.  Mine has lots if clean gain and is very neutral and flat.  Total 3 TL072s. Really only need five op amp stages. Will draw finalized schemo.

[xman]

ok I have done some testing and the best result is with GGG Mini Mixer.

I made only one change: I changed the R10 from 10k to 100k because there was too much gain... now with 100k there's no extra gain... only signal blend.