Zap is a raw PCM pulse instrument. Instead of oscillators, all sounds are created with raw sample values. Choose the length in samples (from only two samples to full 65536 samples), pulse amplitude, width and length in samples.

Bottom screen splits into two parts, the "start" and "end" values which it interpolates between. This means the results range from simple one-sample clicks, simple triggers for sidechain to sound effects, reversed sounds, kicks, to beeps and more. Because all parameters are exposed as automation parameters, you can hook them to external modulators to shape the sounds.

There are three types of triggers - manual, either by clicking the large button on top, or toggling Sync on, or playing a MIDI note. middle C (MIDI value 60) plays the sound at original speed, playing an octave higher plays it twice the speed and vice versa.