The two sliders of the editor's Volume panel, each 0–100 as the app's "Song" and "Original audio" sliders are.
Readonly
The "Original audio" slider, 0–100; it acts only on the mixed track, never on the audio metadata.
The "Song" slider, 0–100; the mix's gain is gainOfVolumeSlider(song) and clips_audio_metadata.song.volume_level.
gainOfVolumeSlider(song)
clips_audio_metadata.song.volume_level
The two sliders of the editor's Volume panel, each 0–100 as the app's "Song" and "Original audio" sliders are.