Cavern Catastrophe doesn't play any ambient track.
Filename: L02 Amb Cavern Stereo
The outdoors areas of Hi Seas Hi-Jinks only use hub ambience.
Filename: L06 Amb Crowsnest Stereo
Some Boiler named tracks are used in Hi Seas Hi-Jinks, but most are unused.
Filename: Lo7 Boiler Fan Room Bg Stereo
Filename: Lo7 Boiler Main Room Bg Stereo
Filename: Lo7 Boiler Met Spin Rm Bg Stereo
Filename: Lo7 Newboiler Main Room Bg Stereo
Filename: Lo7 Newboiler Met Spin Rm Bg Stereo
Filename: Lo7 Tunnel Bg Stereo
The only lava pool in Ant Agony doesn't make a sound.
Filename: L12 Lava Pool Stereo
Unused track related to the ending to the Mechabandicoot boss fight.
Filename: B01 Mechendfall