Dsv1Victor:
Has anyone ever designed a bass guitar preamp using Arduino Mini?Avatar7049 ???
I doubt it, rail-to-rail audio-class opamp(s) would be appropriate.
If you want digital audio processing in realtime, the Arduino Mini doesn't have
the horsepower.
You could use a microcontroller to control a preamp circuit (switching analog switches,
driving a digitpot, acting as noise-gate), but the key signal path would be all analog.