WHAT'S THAT THING ?
In fact, it's simple: it convert a trigger signal (hm, any signals) into a gate signal with CV controle of the time.
With its many inputs and outputs, it's the perfect companion to your favorite ADSR envelope.

It's also a clock generator, a rampe generator, and even a clock divider with the Shift-R extension.

The GATE output is augmented by 2 other outputs: START and END, which generate (as their name suggests) a trig at the beginning of the gate and one at the end.
The END allows this module to be used as a Trig delay, or to trigger another envelope at the end of a note, for example.
The START's output trig is generated each time a trig is received as input, even if the GATE is still active as output. Perfect for retriggering an envelope (if the corresponding entry exists on your module, of course...).

The GATE can be forced to zero by an RST input. (Think of HiHat Open and Close for example)
The input trig and RST each have a push button.

Finally, a switch allows the module to be transformed into a clock generator.
The input triggers the clock, and the RST stops it.

An additional output, not so common for this type of module, provides a ramp for the duration of the GATE.
This gives you access to a voltage that increases throughout the duration of the GATE.
Useful as is, or to send to a waveshaper for example.

The RITOURNELLE Shift-R, adds 8 trigger outputs.
The Rampe value is converted into an 8-bit word.
This allows for clock-type signals at smaller divisions than the duration of the GATE (or the clock in LOOP mode)
A kind of clock divider.