snd_ctl_rename_id — replace the id of a control on the card
int snd_ctl_rename_id
(struct snd_card * card, struct snd_ctl_elem_id * src_id, struct snd_ctl_elem_id * dst_id);
the card instance
the old id
the new id
Finds the control with the old id from the card, and replaces the id with the new one.
Returns zero if successful, or a negative error code on failure.