Syncing an oscillator to the keyboard When using an oscillator at a low frequency for modulation you can synchronize it to each keypress by routing the gate signal to the hard sync input on the oscillator. Each time a key is pressed, the oscillator will be reset. Gates and Triggers Gate signals stay on as long as a key is pressed. In mode one there is also a trigger signal produced. Unlike gate signals, triggers are a very short pulse.
Triggers are mainly for compatibility with other equipment.
Trigger signals can be used to trigger an envelope generator but there will be no sustain level, and they can be used to start sequencers. Normally you will only need gate signals. Using keyboard splits Modes 3 and 4 basically gives you 2 monophonic keyboards. But you can also use one of the sections of the keyboard to control some module's parameter. For example, use the left section of the keyboard to control the filter frequency, and the right section to control the pitch.