The true-bypass is great, as you lose no original signal when not engaged

the buzzing noise was caused by the OCD pedal in enhanced bypass mode?

The fix: opening it up and switching it to true bypass mode from the factory set enhanced bypass mode.

The volume knob lets you correct for all that available drive, and true bypass means you won't lose air and sparkle with your clean tone with this device in your lineup

Four stars for the pedal itself and two stars for the frustration related to the enhanced bypass garbage that made me pull out more hair from my balding head.

The OCD has true bypass and enhanced bypass but regardless where the switch is, it wants the true bypass TC chorus before the OCD