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CV (Control Voltage) indicates which note (event) to play: a different voltage for each key pressed; those voltages are typically connected to one or more oscillators, thus producing the different pitches required. Note that such a method implies that the synthesizer is monophonic. CV can also control parameters such as rate, depth or duration of a control modules.
Gate (sometimes called Trigger) indicates when a note should start, a pulse that is used to trigger an event, typically an ADSR envelope. In the case of triggering a drum machine, a clock signal or LFO square wave could be employed to signal the next beat (or rest).

GATE
Signal de déclenchement (d’enveloppe etc.). Un gate peut être plus ou moins long selon sa fonction de destination à l’inverse du Trig (voir plus haut TRIGGER) qui eux, restent fixes.


CV/GATE
Abréviation de Control Voltage/Gate qui correspond à une méthode de contrôle analogique permettant entre autre la synchronisation de plusieurs instruments électroniques. Pourvu depuis quelques années maintenant d’une prise Midi IN, ce module sert entre autre à contrôler et à synchroniser son système modulaire à un logiciel séquencer PC/Mac.

Volts per octave. This standard was popularized by (if not created by) Bob Moog in the 1960s; it was widely adopted for control interfacing.One volt represents one octave, so the pitch produced by a voltage of 3 V would be one octave lower than that produced by a voltage of 4 V. Notable followers of this standard include Roland, Moog, Sequential Circuits, Oberheim and ARP. This "standard" also required control modules to carry the source voltage (B+, 5v) on the ring of a TRS jack, with the processed voltage returning on the tip. Unfortunately, many other manufacturers have used different implementations with voltages including -5 to 5v, 0 to 5v, 0 to 10v with the B+ possibly on the tip. This makes interoperability of modules problematic.

Hertz per volt. This method (used by most but not all Korg and Yamaha synths) represented an octave of pitch by doubling voltage, so the pitch represented by 2 V would be one octave lower than that represented by 4 V, and one higher than that represented by 1 V.