Increase the volume passed in by 'inc', but not exceeding 'limit'. * The proportions between the channels are kept. * Returns \a v, or NULL on error. \since 0.9.19
See Implementation
Increase the volume passed in by 'inc', but not exceeding 'limit'. * The proportions between the channels are kept. * Returns \a v, or NULL on error. \since 0.9.19