Guitar Amplifier with Digital Effects

University of Texas Senior Design Project- We are building a 100 Watt guitar amplifier with digital audio effects using the beagleboard with simulink.

We are having trouble finding how to adjust the level of effects without having a host computer hooked up running simulink. For example, how to create a longer echo with the use of a potentiometer hooked up to an input on the beagleboard and accessed through simulink. Any help would be appreciated. Registrar: dubhouse1