The recording contains word and sentence lists, male and female discourses and music, as heard by people with -
Flat 40 dB hearing loss
Flat 25 dB hearing loss
Normal hearing to 1kHz, then a loss sloping at 30dB/octave
Normal hearing to 2 kHz, then a loss sloping at 30dB/octave
The recording also contains some tinnitus sounds simulated at different frequencies and with different band widths and time patterns.