Doepfer

Hi Richard

> Is it possible to couple together two Doepfer A138 mixers to give me 
> eight inputs ?
> Anyone know if this is possible ? 
another suggestion (as potential alternative to Dieters instruction):

I have the output potentiometer always set fully clockwise. In other 
words: I do not really need it.

So why not
- replace the poti electrically by fixed resistors
- mount a socket to the hole where the poti was mounted
- connect this socket with a fixed resistor pot and resistor
   to the central mixing point of the mixer.

I do not know the real potentiometer and resistor values at the moment, 
but try these.

Oldinputs O--+
              P      100k
          50k P<-----rrrrr---+
              P              |
              |              |
             Gnd             |
                             |
                             |
Oldinputs O--+              |
              P      100k    |
          50k P<-----rrrrr---+
              P              |
              |              |
             Gnd             |
                             |
                             |
Oldinputs O--+              |
              P      100k    |
          50k P<-----rrrrr---+-----To summing amps
              P              |
              |              |
             Gnd             |
                             |
                             |
Oldinputs O--+              |
              P      100k    |
          50k P<-----rrrrr---+
              P              |
              |              |
             Gnd             |      existing mixer
............................|........................
                     100k    |      new input
New Input O--+------rrrrr---+
              |
              r
              r 47k
              r
              |
              r
              r 3k3
              r
              |
             Gnd


So you would get a fifth input with fixed amplification, which can be 
used as for stacking mixers.

Florian