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Hi Rui,

Thank you so much for your help. I followed your suggestion and now qjackctl starts. As you predicted, a couple more problems appeared:

1. For now I am starting qjackctl in a terminal window. In that window I get the following warning:
Warning: no locale found: /usr/local/share/locale/qjackctl_en_US.qm
Since I can see all the text in English on the gui widgets and the message window, I am guessing this warning is not important.

2. In its message window, qjackctl complained about a missing artshell. I don't know if this is an important problem. In any case I found the option to enable/disable the execution of a script at start time. I unchecked that option, and now I don't see this complaint anymore.

3. In its message window, qjackctl issued a complaint mentioning FIFO and permissions. I looked around the web and I found the suggestion to add these lines to /etc/security/limits.conf:
edward - rtprio 95
edward - memlock 512000
edward - nice -19
After restarting my computer (I'm sure there is a better way), this made the error message go away. From what I read, I have the vague idea that these settings have to do with allowing user 'edward' to execute processes that request "real time" operations. I won't ask you to explain each setting, but I am curious to know whether you think this modification of /etc/security/limits.conf is a reasonable thing to do.

4. I compiled and installed fluidsynth and qsynth from their sources. Then I started qjackctl and clicked the start button; and this appeared to start up jack successfully. Unfortunately when I attempted to start qsynth it reported the following in its message window"
22:10:04.050 Qsynth1: Creating synthesizer engine...
22:10:05.080 Qsynth1: Creating audio driver (jack)...
22:10:05.081 Qsynth1: Failed to create the audio driver (jack). Cannot continue without it.
fluidsynth: error: Couldn't find the requested audio driver: jack
So I am stuck at this point. Any idea what could be wrong?

Thanks for your help and patience,

Edward