I have a Yamaha p250 stage piano; a Yamaha MT120 4-track cassette recorder; two Roland KC Keyboard Amps (a 300 and a 350); a Yamaha FX1 Digitral Drummer; and, a Yamaha AW16G audio workstation.
There is one input on piano (1/4"), which I now have digital drummer in; and, one set of 1/4"...