128 independently controllable slots for recording/playing/manipulating MIDI sequences. Draw in notes, record live, or import existing MIDI files.

Can be used as:

• MIDI looper/sampler - "extra hands" for live playing. Plays back what you play, whenever you want it to.
• MIDI file player, in sync with the host (or not). Seamlessly switch between patterns.
• Composition tool - fit any sequence to any chord progression, on the fly.
• All of the above, simultaneously.

Features/limitations:

• Annoying "DEMO VERSION" text when not licensed (no other demo limitations).
• Optionally delay playback until start of next bar.
• 128 slots, but for now only first 16 show on GUI.
• (Sucky) Piano roll editor with settable loop area, time signatures, etc.
• Pattern chaining: play a specified number of times, then switch to another loop.
• Can play multiple loops at once (ctrl-click for multiple, right-click to play one exclusively).
• Can record live MIDI and optionally start looping it as soon as you stop recording.
• Load MIDI files by drag & drop.
• Optionally syncs to host timeline (position within a measure is kept).
• Loops whole numbers of bars/beats/8th/16th notes, or arbitrary lengths.
• When recording, rounds down the loop size if it's close (instead of bumping up to next step).
• Optional input quantize.
• Can apply a velocity scale and transposition (by semitones and octaves) to the loop in real time.
• Adjustable start and end points for loop playback.
• "Beat shift" time offset with wraparound.
• Selectable MIDI channel (input filter, output filter or transformer).
• Records and plays back all MIDI events it receives, so it's up to you to filter what you don't want.
• Optionally overdub to add data to an existing loop (needs work).
• Supports program change.
• Plays in a synchronized/unsynchronized loop, or unsynchronized one-shot.
• Trigger loop from MIDI notes (mono/polyphonic, with optional transposition), or automate the play parameters.
• Play/mute groups.
• Force to freely definable scale, and transpose within the scale, optionally based on MIDI input.
• Writes an editable MIDI file when saving plugin state (or by save button/parameter), and loads it again at any time.
• Windows only (Mac version is currently outdated).