I read somewhere in this forum that DT Amps don't have a CD/mp3 input. That's right! But... since FX Loop Return is an analog input directly to DT power amp, I can connect a CD/mp3 player jack right there (if I don't need it for the 4 cable method) and i t works fine for jamming along a backingtrack (I've done it).
Very important question: Am I damaging anything in DT amp?
Thank you for your time.