There are two ways to do this:

1. If your keyboard has Midi jacks, BIAB can be set to receive commands such as mute/unmute from the keyboard. Read about the Conductor function.

2. A footswitch, such as one by Delcom, can be programmed to send a keystroke to BIAB. I use mine for Start/Stop but can be programmed for any keystroke such as mute/unmute Bass. Read about Muting Instruments.

R