> > The module can can modified for this function. In principle all switch
> > functions can be controlled by voltages as the three position switches
> > generate internally nothing but 0V/+2.5V/+5V.
>
> dieter, could you publish information on how to do this i am also
> using an a112 for live sampling and looping. operating the rec/play
> switch with the same sequencer setup that provides the gates/triggers
> would make life on stage with this module a lot more relaxed.

It's very simple. The center pin of each switch is connected to an ADC pin
of the microcontroller. In the center position the voltage generated by the
switch is ~ 2.5V (nothing but a voltage divider made with two resistors
connected to +5V and GND). In the left/right position the terminal is
connected to +5V or GND. If you apply a voltage in the range 0...+5V to the
center pin of a switch (and make sure that the switch is in the center
position) you can switch between the 3 function with an external voltage.
But you have to pay attention that no negative voltage and no voltage beyond
+5V is applied. In this case the microcontroller will be damaged. Protection
diodes connected to GND and +5V in combination with a serial resistor (~1k)
should be sufficient.

> another great help would be separate inputs for the recording gate and
> the playback triggers - at the moment i have to manually reroute the
> cable. can this be hacked

That's not possible without substantial hardware and software modifications.
Probably another microcontroller would be necessary as all pins of the
existing controller are in use.

> one last question. would it mean a lot of work to increase the amount
> of memory i'm sure these days the cost would be of little
> consequence, and at 32khz the memory is very short. i have the
> impression that the module was conceived firstly as a wavetable
> oscillator, but its sampling option really is a lot of fun.

Even this would require a complete redesign as the microcontroller has only
16 addresses (A0...A15) available. RAM circuits with more memory are
available (the A-112 was developed ~ 10 years ago) but not pin compatible
with the chip used in the A-112.

We discussed several times if the sampler should be redesigned but after all
it requires the same development time as a totally new module (and we have a
lot of new modules in the waiting loop that would have to be postponed for
the benefit of a redesign).


Best wishes
Dieter Doepfer