The synth has a resonant multi-mode analogue filter for each voice, and three distortion points for each voice – pre-filter, post-filter and global – in an analogue signal chain. Peak is capable of receiving polyphonic aftertouch, which puts expression right at your fingertips. Reverb, delay and chorus effects are at one's disposal, and there is also an on-board arpeggiator.

The modulation system puts a 16-slot modulation matrix and 16 direct assignments in the main controls, cleverly arranged for intuitive patch design and sound editing. There are three ADSR envelopes and two LFOs for each voice, and more elaborate movements and secondary ‘via’ assignments are made just a few menu button presses away. In addition, two animate buttons give live performers instant one-touch transformation of patches.

Peak connects to modular systems via a CV modulation input, and has MIDI I/O on five-pin DIN ports, so other MIDI gear can be connected. Via USB, Peak can be plugged into Mac or PC, where unlimited patches can be kept using the Components software.