[LAU] Problems with Jack after upgrading Mint

[Bill Purvis]

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 at billp.org                  |
+----------------------------------------+