Incorrect hit sound format. "soft-hitclap.mp3" is using the MP3 format and is used for active hit sounding, see 00:06:317 (3) - in [Hard] for example.
I converted it to wav i think
Unused files. "drum-hitclap.wav" "drum-hitwhistle.wav" "soft-hitclap2.wav" "soft-hitclap3.wav"
delted