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OFFLOOP
Web MIDI Sequencer

Unfold MIDI sequences with constant
variation using the loop offset setting.
Force all sequences to scale, transpose or
tempo map creating song style key changes
My HTML sequencer I’ve been working on for the last few months just got accepted for the 2025 MIDI Innovation Awards!!!
Please check out the short video showing it in action here (or read the text below)
Voting just opened and I’d love your support – Vote for OFFLOOP by Stringer Audio here.
(Also check out the other entries, there’s some crazy stuff to read about and you have to vote for 3 entries anyway – so spread the love.). I’m in the Startups, Prototypes and Non-Commercial Software Products. Voting closes August 4th 2025
Quickstart and try it out HERE.
It’s quite a complex beast but has a lot of innovative functionality.
OFFLOOP is a browser-based 4-channel, 32-step sequencer with per-channel loop lengths and offset modulation for evolving, morphing patterns.
It features split preset management, allowing separate control over sequences and song structure.
A 32-step song automation lane enables anything from rapid sequencing to ultra-slow mutations with global key and tempo control of the 4 channels.
Each sequencer includes dual note delays with transposition and key-locking.
Presets are saved as text for easy import/export and bulk generation.
Sessions auto-save in your browser. OFFLOOP supports internal sound or MIDI output and records fader movements into sequencer channels.
Latest version is here.