I've been looking for some options for software to run on the Tinkerboard.

Pure Data has cropped up in a few old examples and I think it is worth some investigation.

This example uses PD on a Raspberry Pi, controlled via TouchOSC app on a phone:

http://www.instructables.com/id/Pure-Pi-Control-custom-stompbox-effects-on-a-Raspb

And this one is a project that uses PD with an Arduino (running Firmata) as an input reading Stompbox switches and a DIY expression pedal:

https://guitarextended.wordpress.com/2013/01/31/raspberry-pi-multi-effects-overview-of-the-setup/

I would love to take elements from both of these to come up with a setup that can operate like the second link, with a TouchOSC interface for more complex parameter editing.