Regarding the sound desync issue since 1.37, rdanbrook has plans to rewrite the APU to fix it. Probably won't be anytime soon, though. For now, setting the speed (under timing) to 61 is a good temporary fix.
Just don't bother playing any PAL games under this setting until then, unless you want to play Super Turrican in 'turbo mode'. https://github.com/rdanbrook/nestopia/issues/34