There are 49 themes with 4 variations each = 198 tracks.
The 49 themes are split into:
- Are you in combat - world level 1 to 8 = 8 tracks
- Is the weather bad - world level 1 to 8 = 8 tracks
- Is the weather good - world level 1 to 8 = 8 tracks
- Do you have low health - world level 3 to 8 = 6 tracks
- (Are you engaging a Titan - world level 1 to 8 = 8 tracks)
- Default - all worlds = 11 tracks.
Once a theme is selected the variation is selected:
- Ambient - is it night time.
- Uncut - are you alone.
- Drone - are you underground.
- Fullmix - are you with other players.
So if you predominately play on a single world then the tracks are limited to 16 themes.