Simontl What kind of flexibility are you going for?
Currently it only supports positive voltages, however the range of the input voltages supported (e.g.: 0:5V vs 0:10V) affects the range of the potentiometers (possibly depending on the PSU in use). We are looking into adding optional support for negative input voltages, with the addition of an optional resistor.
Simontl Will schematics be available?
At least enough to be able to build it!
Simontl I'd personally like a Bela with no pots (only ins and outs) for eurorack, in a minimum space in terms of HP.
It sounds like in your case you may just need a voltage divider at the input (e.g.: 62k + 38k), and a series resistor (between 1k and 5k) at the output in order to protect the device.