This is the Roland SC-55 (original model) MIDI sound module, released in 1991. It has the GS and GENERAL MIDI logos, so it's likely a later production run. I've confirmed ROM playback on the unit itself, as well as performance via MIDI input. Sound output was normal from the rear line outputs and the front headphone output. (Working video: https://youtu.be/qUiHC_hh8-M) The card remote control also works without issue. (The instrument list from the manual is still attached.) ※ Two screws are missing from the bottom of the unit, which secure the front panel. ※ Some of the unit's buttons are unresponsive. 　・PART [→] 　・INSTRUMENT [←] 　・CHORUS [←] I've performed a basic operational check, but this is a layman's inspection, so there may be oversights. As this is an electronic device over 30 years old, please refrain from purchasing if you are looking for a perfect unit or require a warranty. The original box is rare these days, so I will pack it in separate recycled materials and ship it via Yu-Pack in a 100-size box. 《Contents》 　・SC-55 (Main unit) 　・Original AC adapter 　・Card remote control 　・Instruction manual ※ MIDI cables, audio cables, and the speakers in the video are not included. 【End】 #Roland #roland #sc55 #midisoundmodule #dtm