PO-33 K.O! - how do i delete a sound? March 26, 2021 17:45 Updated hold [record] and press [sound] to delete the currently selected sound. for more information see the user guide. Related articles PO-33 K.O! - how to transfer data for backup and restore. [video] PO-33 KO!, PO-35 speak, how do i record? pocket operator - how do i turn it off? pocket operator - does it have a metronome or click track? PO-33 K.O! - how do i change the volume level of an individual sound in a sequence?