- "Freq Start" and "Freq End" dictate from which base frequency the oscillator starts when a trigger is applied and at which frequency it stops.
- "Speed" controls the speed of the oscillator sweep from Start to End frequency.
- "Release 1" determines in 16 steps the decay time of at least one envelope in a range of few umpteen milliseconds to some minutes. "Release 2" is responsible for the decay time of an 'opposed' operator. The specific assignment depends on the chosen algorithm, see user manual.
- "Algo" selects on of the six algorithms which use either two or four operators.
- "Ratio" controls the integer frequency ration between the FM operators.
- "Waves" choses one of the 64 specific combinations of the eight waveforms which are used by the selected algorithm.
- In eight steps "Fb" dials in the feedback amount of the first operator. Feedback creates more percussive sounds at some settings.
A trigger at the "accent" input will emphasize the sound, a trigger at "choke" input will cause an abrupt cut. The module can be played tonally via the two "1V/Oct" inputs, e.g. for nice FM basslines.
Please note: The CV inputs are read out only when the module is triggered and stay static until the next trigger impulse. The original FM chip has technical limits like stepped parameter values, quiet clicks when editing and a subtle high-pitched tone. A stable power supply with plenty headroom is recommended.
two 1V/octave inputs, trigger input, accent input, choke input, audio output
CV inputs for: speed, algorithm, release 1, release 2, waves, ratio and feedback
3U Eurorack module, 18HP wide, 32mm deep
current draw; 70mA at +12V and 30mA at -12V