Roland's MIDI sound module SC-88Pro and a separately purchased USB-A to MIDI (x2) adapter cable, the MIDIMATE eX. I have confirmed that this combination works (PC is Windows-based). I acquired the SC-88Pro this year, used. I enjoyed playing MIDI files I had obtained in the past, but when I tried to set up a music production environment, I realized that the times have moved towards DAWs, so I'm letting it go. There are no included accessories. The ESI MIDIMATE eX USB MIDI interface with integrated cable is excellent, allowing for two MIDI connection ports from a single USB port, and it's both IN and OUT compatible with automatic detection.