The ES09 can be used as both a rising slew rate controller, or a upwards sloping ramp LFO by hooking the [DOWN PULSE OUT] into the [START] input. In this configuration it also operates as a utility oscillator, suitable for fixed key sequencing and general sound effects and noise making. It is not, however, suitable for tracking a keyboard.

The slew rate is adjustable from ~500uS to ~17 seconds.

Build Guide