A pity.....
Some good news though - I appear to have sorted the PulseAudio Volume Control on startup 'freezes' on "Establishing connection to PulseAudio. Please wait..." issue with the Pismo G3 MintPPC installation.
It appears that the installer only installs the pavucontrol package (hence the PulseAudio Volume Control app icon being present) but not the essential pulseaudio package!
To fix the problem:
1. Go to root via
su --login
2. Then bring the system up to date
apt update
apt upgrade
apt autoremove
3. Then fix pulseaudio
apt remove --purge pavucontrol
apt install pulseaudio pavucontrol
4. Exit root and at user prompt
pulseaudio --start
and then PulseAudio Volume Control should be working and not freeze at "Establishing connection to PulseAudio. Please wait..."
EDIT:
1. Fixing pulseaudio also restores the functioning of the volume down (F3 key), volume up (F4 key), and volume mute (F6 key), although the stepping is not continuous (unlike with OS9 and OSX) and there is a response time-lag, so avoid pressing the F3 or F4 key rapidly or holding them down, otherwise you will get stuttering audio as the playback volume and the volume change go out of sync.
To see if I can minimise this, I have edited /etc/pulse/daemon.pa and added to the file, the following lines since pulseaudio is a network-capable multichannel software sound server 'sitting' above alsa:
# realtime-scheduling = yes
realtime-scheduling = no
and will be testing to see what effects, if any, these two settings each have on audio.
2. Another relevant issue to note when changing the volume control panel settings (accessed via right-clicking on the volume icon in the panel) appears to be that only a USB mouse button right-click functions within the LXDE panel, not right-clicking via CTRL + Click or via a three finger tap on the track/touch pad.