I've had the opposite reaction from the crowd. When playing midi accordion with a ketron sd3 (no midifiles/mp3s), I had a request for an ethnic song I didn't know. The requestor said "c'mon Im sure you have it in your computer there"..I was insulted they assumed I was playing along with fully recorded tracks. Another musician told me my best friend used cd's to play with . I know for a fact he never did nor did he use mp3s or midifiles. He was just good with his arranger.