Please comment before purchasing to confirm availability. SX-V8 Sound can be produced. I'm not sure if the sound is normal, but sound came out of both sides. DX-77 CDs can be read and played. MX-12 Power has been confirmed, and volume up/down adjustments were confirmed by connecting it to a CD component and speakers. TX-12 Power and button operation have been confirmed. Since these are all old items, please consider them as junk items.