stretch_midi_notes
Alter MIDI note timing by scaling positions and durations around a pivot to create half-time, double-time, or custom tempo changes while preserving rhythmic relationships.
Instructions
Stretch or compress MIDI timing (half-time, double-time, or any ratio).
Each targeted note scales as a rigid unit about one fixed pivot: its distance from the
pivot and its own length both multiply by factor, so the rhythm is preserved and only
the speed changes. Notes that land past the item end are kept as-is; one pushed before
the item start begins at the item start but keeps its scaled end, so it comes out
shorter. Both are counted in out_of_bounds (clamped stays 0 here).
Args: factor: Time scale ratio, must be > 0. 2.0 = twice as long (half-time), 0.5 = half as long (double-time). pivot_beat: The fixed point, in beats from the item start; may be negative. None = the earliest targeted onset.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| factor | Yes | ||
| fields | No | ||
| channel | No | ||
| end_beat | No | ||
| pitch_low | No | ||
| item_index | Yes | ||
| pitch_high | No | ||
| pivot_beat | No | ||
| start_beat | No | ||
| track_index | Yes | ||
| return_notes | No |