Function trackerPattern

trackerPattern(file: MidiFile, stepsPerQuarter?: number): TrackerRow[]
A MIDI file as tracker pattern rows: stepsPerQuarter rows per quarter note, one column per channel that plays, and a cell naming the note that starts on that row (the highest when a channel starts several at once, as a tracker cell holds one). Steps are counted in the file's own ticks, and a row's time follows its tempo map.
Parameters
- file: MidiFile
- stepsPerQuarter: number = 4
Returns TrackerRow[]
Example
```
import { trackerPattern, type MidiFile } from '@datamoc/mwg/audio';

declare const file: MidiFile;

const rows = trackerPattern(file);
console.log(rows[0].notes); // the first step's notes by channel, or nulls
```
- Defined in src/audio/AudioViews.ts:100