Editors

The bottom panel displays an editor that auto-switches based on the current selection. Select a MIDI clip and it shows the Piano Roll; select an audio clip and it shows the Waveform Editor, and so on.

Editor	Shown when you select
Piano Roll	A MIDI clip
Drum Grid Editor	A drum clip, or a DrumGrid device is active
Waveform Editor	An audio clip
Track Chain	A track or device

Each clip editor (Piano Roll, Drum Grid, Waveform) carries a Loop toggle in its header that turns the selected clip's own source loop on or off.