It should be possible to keep on working on the project while listening to it. If you devs are scared this might brake some things: make it optional so that people like me, who prefer to listen while editting can live with the possible dangers (if the autosave option I wished for in another bugreport is implemented as well this would be less of a problem).
AudioStack has been completely rewritten. So this bug(s) should be closed. If you really still have this issue, feel free to reopen it.