ags_drum_output_pad_callbacks
void ags_drum_output_pad_play_done (AgsRecall *recall, AgsRecallID *recall_id, AgsDrumOutputPad *drum_output_pad);
AgsRecall *recall
AgsRecallID *recall_id
AgsDrumOutputPad *drum_output_pad
void ags_drum_output_pad_play_cancel (AgsRecall *recall, AgsRecallID *recall_id, AgsDrumOutputPad *drum_output_pad);