Our Tension Controllers use a conductive rubber cord as a voltage divider interfaced with a teensy arduino board. One Tension Controller consists of a conductive rubber cord used to control an oscillator in teensy as 3 copper tape touch sensors modulate the frequency. Each plate acts as a gate for the oscillators and when the conductive rubber cord is pulled, it modulates the frequency of the waveforms.
The second Tension Controller is also used to control an oscillator that is modulated when the conductive rubber cord is pulled. The cord rests on a bridge that has a piezo disc underneath that is activated when the cord snaps against the bridge or when the board is knocked.