I think it's not easy to built a universal board that covers all
applications because different sensors require different signal processing.
It depends upon the type of sensor output (e.g. voltage, current, variable
resistor/capacity/inductivity), the input range of the sensor parameter and
the desired output voltage range. For example the circuit of the A-198
includes two such "interfaces": one for the position sensor (three-terminal
potentiometer-like sensor) and one for the pressure sensor (variable
resistor). Other examples are the A-174-1 (joy stick) or the announced
A-174-2 (wheels). In any case the circuit has to be adopted to the sensor.

From our experience the inquiries for anything that has to do with DIY (e.g.
A-138x, A-101-9) are very poor. After all it's not very complicated to built
such an interface from the technical point of view. Mostly it's nothing but
some kind of amplifier as shown on our A-100 DIY page adopted to the special
requirements (like suitable amplification, adding or subtracting an offset
voltage and maybe voltage inverting).

Best wishes
Dieter Doepfer

> To be more clear, I would like to be able to have a circuit board
> that has multiple c/v outputs and a single or even multiple
> inputs that one could attach accelerometers, switches, touch
> pads, sensors, etc.
>
> The main interest would be that one could develop controllers
> within the modular framework without using MIDI. There are now
> many products on the market for this type of experimentation
> having one specifically to use with modulars would be nice.