I have tested this with just pmsys sw (ie ignoring my cpflight hw), but when I press fire bell test on the pmsys fire panel, there is no sound, but when I click on the wav for fire bell in pmsounds, it works fine.

Stall warning test and overspeed test buttons on the pmsys aft ovhd also do not ignite any sound, but I can't see wav files for these in pmsounds