Digital Audio Workstations

Seq66 – MIDI sequencer and live-looper

Seq66 is a MIDI sequencer and live-looper with a hardware-sampler-like grid-pattern interface. It’s built around the concepts of loops.

Seq66 is a reboot of Seq24, a live-looping sequencer with an interface similar to a hardware sequencer,
refactored for newer versions of C++ for faster and simpler code. It drops the Gtkmm user-interface for Qt 5, and has better handling of sets, mute-groups, sessions, playlists, and automation control.

It supports the Non/New Session Manager, has a metronome function, multiple input port recording, a modiable color and brush palette, and Qt style-sheets.

This is free and open source software.

Other features include:

  • Supports MIDI only (the software does not handle audio, nor is it a synthesizer).
  • Live tab – provides a grid of patterns that display recorded MIDI data, status information, and provides popup-menus for each pattern.
  • Song Editor – combines all patterns into a complete tune with controlled repetitions of each pattern.
  • Pattern Editor – record and edit notes and other MIDI events.
  • Event Editor – observe the details of events. It’s useful for trouble-shooting a song.
  • Playlist Editor – create playlists.
  • Sets Editor – see, edit, and rearrange the sets that a tune contains.
  • Mutes Editor – turn on or off multiple patterns at once.
  • Session tab – displays certain aspects of the running setup.
  • MIDI control/display automation
  • Supports ALSA and JACK (but not Pipewire).

Support: GitHub Code Repository
Developer: Chris Ahlstrom
License: GNU General Public License v2.0 or v3.0

Seq66 in action
Click image for full size

Seq66 is written in C++. Learn C++ with our recommended free books and free tutorials.

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