Numerology is a music sequencer based on a modular approach to step sequencing. It comes with 5 primary note-based sequencing modules, including monophonic and polyphonic sequencers, dedicated sequencers for chords and drum parts, and a flexible matrix/arpeggiator sequencer combo. There are also three CV-based sequencers for use as modulation sources or for directly emulating analog sequencers.

Almost all of the compositional parameters (sequence direction, rate, gate length, etc) in Numerology can be modulated from a variety of sources, including other sequencers, external sources, LFO modules and Envelope modules.

There are also many other types of modules, for generating and processing MIDI data, internal CV (i.e. automation) data, and audio.

Users can organize the modules they use in Numerology's projects into separate groupings called Stacks. Each stack has some modules, a track in the arrangement timeline, and a channel in the mixer.

When running standalone or as a ReWire synth, Numerology is also a flexible Audio Unit plugin host that offers some unique features including direct modulation of AU parameters, and flexible audio signal routing.

Numerology can run standalone, as a ReWire synth, or as a VST, AU, or AU MIDI Effect plugin (with LogicX).

It comes in two versions: Numerology SE is the base version for users primarily using it within another host, Numerology Pro is for advanced users and includes these extra features:

• Multi-output support for hosted AudioUnits.

• Automatic plugin delay compensation.

• Per track audio delays for customized delay compensation.

• Monophonic audio routing support.

• OSC (Open Sound Control) support.

• A dedicated dialog for editing MIDI & OSC mappings.

• Custom scale quantization (via the Custom Scale module).

• Several advanced modules for working with CV signals.

• More customization options for the Evolve function.

• Unlimited Undo & Redo w/ Undo History.