＜Operational Status at Time of Listing＞ ・I have confirmed that it is functioning correctly with a MIDI sound source track in "GarageBand" after connecting via Bluetooth using the "Audio MIDI" app on a Mac PC. ・Operation via USB connection is unknown (I have never used it). ・Operation with devices other than a Mac PC, including Windows PCs, is unknown (I have never used it). ＜Other Information＞ ・I purchased it new and used it for composing a few times. ・After that, I stored it without using it for several years. ・There are stains and scratches commensurate with age. ・There are no accessories other than the main unit, such as batteries. Thank you.