Quote:
as well as the volume knob on the bass itself
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Are you saying the knob on the bass doesn't go down to zero?
I've never seen a bass (or guitar) attenuator. When I search I only find attenuators for the "speaker-side" of the amplifier. You can get microphone/XLR attenuators, but then you'd need a DI box. (If you already have a DI, that might be a good solution.)
If you can solder it's easy to build an attenuator (two resistors to make a
voltage divider or a pot, plus the connectors and case/housing).
Otherwise, your best option is probably to get a different interface with a knob that does turn-down to zero.