According to Bnnm on HCS64, this game uses unknown ADPCM codec, close to PSX ADPCM with 0x08 frame size and modified filter/shifts. The data starts at 0x800 with 22050Hz for the sample rate and stereo.
Example:
http://coraksoft1.narod.ru/temp/games/CLEARIT.DSF
Music pack:
https://cloud.mail.ru/public/7HqA/hr9vc ... s_Music.7z
Thanks!