Shin's Music Baby Master 2 Purchased new in January 2024. I checked the operation once, but I was satisfied with that and haven't used it since, so it's almost new. *Operation confirmed before listing. The product contents are all in the photos. Instant purchase is welcome, and price negotiations are not accepted. Thank you. This unit is designed to be connected to the Amp's Send/Return (Loop) and lower the volume. ・If your amp has a Loop on/off switch, turn the Loop ON. ・If your amp has a Loop-Mix knob, set the Mix to 100%. ・Please note that this cannot be used with parallel loops. ・If you connect other effects to the Loop, connect this unit at the end of the effects chain. It's simply one knob and IN/OUT. It's passively tuned to lower the sound in a good way. Guitar Bass Effects pedal Amplifier