This is a listing for a Guyatone ECHO CHAMBER EM-606. It was stored in my grandfather's warehouse. I confirmed its operation on 2025/05/20. I tested the front input and output with a guitar and guitar amplifier. The volume knob works normally and produces sound, but the input jack seems to have some contact issues. The BASS knob works normally. I didn't notice any changes with the other knobs. I haven't confirmed the tape section's operation. There's a rattling sound coming from inside. Please consider this as a junk item. I will not be making this a dedicated listing.