I opted for the 61 keys, and because I did not need an expander, my computer is enough.

USB connector (self-supply) and MIDI (auto power when connected the computer via the supplied cable)

UTILIZATION

My use is simple: I enter the notes to the keyboard not not, can I correct the VLOC so touching I do not care. I only use the transposition for comfort.

OVERALL OPINION

There is latency in the USB, against the MIDI port is nickel. The software provided is twelve o'clock trs low end, but personally I do not care compltement, as I have my own software.