grav / seq

Midi step sequencer entirely in ClojureScript. Uses the Web MIDI API

seq

A Midi step sequencer that runs in the browser.

Overview

Seq is a Midi step sequencer that runs in the browser. It uses the Web MIDI API for communicating with devices (Web MIDI is currently only supported in Chrome).

Seq creates a step sequencer for each output device that it finds. You can configure the output channel for each device, but that's it!

Check out the video at Vimeo

The plans for the future include:

• Multiple patterns per device
• De-activating MIDI devices
• Saving the port and inactive devices between sessions
• Creating several parallel step sequencers for each device (with different ports)
• Saving the sequences(!)
• Showing the playhead (currently unprecise)
• Support for Launchpad as input/output device (work in progress)
• Variable pattern length
• Shuffle
• Parameter sequencing (velocity, CC#, ...)

Setup

To get going, run

lein figwheel

and open your browser at localhost:3449. You should then see a step sequencer for each connected device. If you dis- or re-connect devices, the UI will reflect this.

Tech stuff

Seq is implemented in ClojureScript and uses the React-wrapper, Reagent for the UI.

For timing, it uses the techniques from Chris Wilson's blog post A Tale of Two Clocks with a more "functional" approach.

License

Copyright © 2015 Betafunk

Distributed under the MIT License