Set [DURATION] and [WINDOW SIZE] to '0',

Set [RISE] and [FALL] to their maximum position,

Adjust P204 until TP1 measures 4.0V,

Patch [END] to [CYCLE],

Monitor the [ENVELOPE] output using an accurate multimeter (ideally with 4 decimal places),

Set [RISE RATE] and [FALL RATE] for aslowly undulating waveform,

When the waveform is around 2.5V apply a DC voltage of 5V to [HOLD],

Adjust P101 for minimum drift.