Roland SC-55 Sound KaraOK cost performance/mute track 10able

Roland SC-55
Patch 314(Not GM Ver), 317(GM Ver) 325?
DrumKit 9
MaxPoly 24
Channel 16
Effect Reverb(8Type), Chorus(8Type)
Size 1U Half Rack
DAC NEC uPD6379
Sample 16bit 32KHz
MIDI IN , MIDI OUT , MIDI THRU
OUTPUT L/R (RCA-PIN JACK)
PHONE (STREO-mini PLUG)
INPUT L/R (RCA-PIN JACK)
AC Adapter (ACI-100)