Using Big Muff Hardware plugin with Ableton Live 11 Suite.

Drivers installed, plugin is showing on the track. I follow directions: from the hamburger menu, choose “Select Device”, Device Serial Number, Audio. Nothing happens and the Status light in the plugin does not light up to green (it stays grey). The plugin shows I’m on software version 1.0.70 and confirms that is the latest available version.

The pedal status light is green.

Any help on what I am missing? Thanks!