Add Mute function to Polybeats

Hi people. I would like to add a sample mute function on this fabulous patch.
It could be so usefull to improvise rythms and play with another machines.
I´m trying to understand the code behind this patch, but I couldn´t figure out how I could manage it.

The Mute function could be pressing AUX + KEY if AUX start/stop function could be improved as hold 1 second the AUX button.

Do you think it this possible?

Thanks in advance