[LAU] Problems with Jack after upgrading Mint

I've not done much of late, busy with other things, but I had cause to update Linux Mint to 19.3 last week. Just tried testing various things and hit problems with Jack. I'm running jackd2 1.9.12~dfsg-2 and get noises with nothing running, and when I try running some midi files via Calf Fluidsynth, the noises are nothing like what they should be. I then switched to using the latest Yoshimi (1.7.1, thanks Will) and that also produces awful noises. However, if I shut down jack, yoshimi happily switches to direct via Alsa and sounds perfect. However, my sequencer (home-grown) relies on Jack, and Calf Fluidsynth also seems to be fixed on using Jack. Any ideas where to start tracking down this problem? Bill (getting older... :-( ) -- +----------------------------------------+ | Bill Purvis | | email: bill(a)billp.org | +----------------------------------------+