Bela board is 0-5v on analog in/out , and 0-3.3v(!) on digital i/o (and not 5v tolerant)
Salt is 5v (but CV compatible) and the knobs can be used as offsets.
I suspect most use the supplied web frontend, which is pretty good… not only allows uploading/viewing/editing of code, but also has a scope function. (of course you can use ssh if you wish too)
screen, yeah I connected a small oled, pretty simple… best done as a separate process , and then an aux task in bela dsp, to not disrupt dsp… but ended up finding i didnt use it much, so its back in the toolbox.
axoloti is 2v pp on audio output , so -1v to +1v, so possible, but not a huge range for cv.
there are also a couple of analog outputs (and quite a few inputs) you can use, are ok, if you make sure you stay
in the 0…3.3v range. (simple opamp/diode clamp works) - a few have done this so there are resources on the axoloti forum. so axo is not the simplest, but its by far the cheapest, excluding arduino, and is really flexible…
(I love axoloti as a ‘utility box’ )
as others have said, they all do the ‘simple task’ of handling cv, some with more effort than others, but also at very different costs too, all these things also do a huge amount other than just CV IO, so you might want to consider that too.
Id say the choice is really, what do you want to do… e.g. do you need a screen?, what do you want to code in? how many cv i/o?
its probably also fair to say, as these things are all very flexible, they all have a ‘time investment’ involved to understand the platform… (this is the bit I really enjoy, understanding what they can do and how )
