voice_check - Man Page
Checks whether a voice is currently allocated. Allegro game programming library.
SAMPLE *voice_check(int voice);
Checks whether a voice is currently allocated.
Returns a pointer to the sample that the voice is using, or NULL if the voice is inactive (ie. it has been deallocated, or the release_voice() function has been called and the sample has then finished playing).
allocate_voice(3), voice_start(3), voice_get_position(3)
version 4.4.3 Allegro manual