Korg Volca Drum - Modified mute button 

I modified my Volca Drum by adding a toggle switch to activate the Mute function. This allows one-fingered management of drum parts.
I'm not the first to do this, so props to the OG's - feel free to claim your claim in the comments.
It's probably very long and boring unless you're actually going to do this yourself, in which case it's still long but less boring. The same principle applies if you want to mod any of the other buttons.