The MIDI Maker timeline arranger — key segments, chord segments, instrument clips, and how to arrange your track.
The Progression panel is the timeline arranger at the bottom of the studio. It shows the full arrangement as a horizontal, scrollable grid: bar numbers across the top, then one row per lane — key segments, chord segments, and one clip row per instrument.
Zoom in or out using Ctrl + scroll wheel (Cmd on Mac), or the ± buttons at the left edge of the panel. The grid always snaps to 1-beat resolution.
Click anywhere on the bar/beat ruler at the very top of the grid to jump the playhead to that position. This works whether the track is playing or paused.
The key lane is the top row of the arranger. Each segment defines the root note and scale for a section of the track — E minor, D major, and so on. All instruments in that section play within the same harmonic context.
Click a segment to open its popover, where you can change the root note, scale type, and segment length. Drag the right edge of a segment to resize it — the adjacent segment extends or contracts to keep the lanes contiguous. Lengthening or shortening a key segment ripples into the chord and clip lanes below.
The chord lane sits directly below the key lane. Each segment selects a chord pattern — the harmonic sequence the instruments play within that portion of the track.
Click a segment to open its popover and choose a different chord pattern, or adjust the segment length. Chord segments are independent of key segments and can be any length.
Below the chord lane, each instrument has its own clip row. A clip defines the window of time in which that instrument plays — gaps between clips are silence.
Rhythms stay phase-locked to the global bar grid — a clip is a gate that lets an instrument play, not a phase shift. Moving a clip changes when the instrument plays, not how its rhythm lines up to the bars.
Generative clips roll fresh variations every playthrough. When you hear a take you want to keep, click the clip and choose Commit to notes: the exact notes you last heard in that clip are frozen onto it and open in a piano-roll editor. If the clip hasn't played yet this session, a fresh take is generated for you.
The note editor is the same piano roll used by the motif creator — committed clips simply edit absolute notes instead of a reusable motif.