Roger, the existing noise controls do not work to control noise nuisance from amplified music. The Licensing Act could (but also often does not, because of the incompetence of local council officers). Unless any new exemption is framed so that it does not apply to music in licensed premises (or their curtilage) is inaudible from other nearby premises you are simply proposing that your preferred entertainment should be permitted to be a nuisance to others.

Incidentally, I believe that "inaudibility" ( after 10 pm) inside other dwellings may be the standard applied by Glasgow council.

A 100 limit exemption for unamplified music could work.