Man pages matching name read_sound_input in section 3alleg4:

read_sound_input.3alleg4.en	debian 10 / allegro4-doc
read_sound_input.3alleg4.en	debian 11 / allegro4-doc
read_sound_input.3alleg4.en	debian 12 / allegro4-doc
read_sound_input.3alleg4.en	debian 13 / allegro4-doc