fsxpaul wrote on Feb 4^th, 2015 at 1:38pm:

rcpistonhead wrote on Feb 3rd, 2015 at 11:33pm: tried all of the suggestions: loading the 727 twice To be clear, this is not re-loading the aircraft twice from the main menu. This is setting-up a keyboard short-cut for 'Aircraft (reload)' in the 'Controls' menu. Mark and many others use 'Crtl+Shift+R' key combination. Here's how to set it up if you haven't already done so: Select from the main menu; 'Options','Settings','Controls'. Select the 'Buttons/Keys' tab. Make sure that 'Event Category' is on 'All Events'. Scroll down the list to 'Aircraft (reload)' and mouse click once. (it's the 11th one down in the list). Click the button 'New Assignment'. A dialog box opens; press and hold all 3 keys: 'Ctrl', 'Shift' and 'R' then release the keys, then select 'Okay'. Use this keyboard short-cut to 'Reload' your aircraft to have the cockpit sounds work.

It works for me regardless of whether I use the CTRL+SHIFT+R shortcut, or Menu > Aircraft > Select Aircraft > press ENTER to reload the same 727. :-/

Once I reload the 727, I have all the sounds working like they should.