Ocenaudio Accessibility on M1 MacBook Air

Hi,
Is anyone familiar with the Ocenaudio app latest version on M1 Air? I specifically have trouble with doing the basic cutting audio file function; most buttons such as the play/pause and fast forward/rewind are all dimmed, even though the file is already opened to perform action. I'm wondering if this is the app accessibility, problem with its overall function, or some kind of bug.
Any information on this issue is appreciated.

Thanks!