I just tried for the first time using halion sonic 3 as the default synth with program changes set to GM mode and was able to change volume in the plug in without a crash (so far!). I never changed the default synth before, so now I think I will play around with this. Can one use different plugins per instrument? Might be interesting. FWIW, I am on the latest version of Windows 10, BIAB 612 and latest Halion/Sonic.