The volca modular is a semi-modular "West Coast style" synthesizer consisting of independent analog synth modules, digital effects, and a sequencer. Each of the modules has been carefully selected for its stand-alone completeness. The modules are internally connected so that sound can be produced even before connecting the included pin cables, and the routing is shown by white lines on the panel. Module connections via a pin cable take priority over the internal connections, bypassing them.

The unit's compact chassis provides 50 patch points. Inputs and outputs are color-coded for recognition at a glance, and the signals are also marked by symbols to indicate audio, control, gate or trigger. Normally, each signal is connected according to its use, but on the volca modular, signal levels are universally compatible between modules, allowing hidden possibilities to arise from patching that defies common sense. Twenty pin cables are included, and also included is a reference sheet explaining each patch point and providing basic examples of patching.

While the volca modular is a semi-modular synth, it is equipped with a full-fledged 16-step sequencer providing a wide range of functions, letting you enjoy automatic performance even when used stand-alone.

Using the 16 buttons familiar from the volca series, you can perform step input or use the buttons as a keyboard for realtime recording. The pattern chaining function plays back multiple sequence patterns in succession, allowing you to connect up to 16 sequences with up to 32, 64, or even 256 steps to create large-scale development.

Two new sequence modes have been added: bounce sequence mode which makes a round trip through the steps, and stochastic sequence mode which gradually proceeds while randomly moving forward and backward.

Although the volca modular is a West Coast style synthesizer, it also provides flexible support for music as a contemporary instrument. You can choose from 14 types of scale including equal temperament. Since you can also specify the tonic key from which these scales start, you can play these scales in any key.

There's also a micro tuning function that lets you individually specify the pitch of each note. You can pursue your own unique music by performing in an original tuning with the pitch of individual notes raised or lowered.