I'm pretty much a Linux noob and for the moment I haven't figured out why PP won't boot from the HDD and only from the CD, even if the save file is on the HDD, but that's a subject for another thread and I'm sure I'll find the answer on these pages (brilliant forum, thank you to all). I think I have to delve into GRUB...
My main problem was that on the laptop, an MSI CR70, ALSA detected two audio cards/chips, a HDMI and an Analog. Using a topic in this forum I have fixed that problem - thank you very much.
This left me with an unexpected problem, the volume control in the system tray was at 100% and didn't respond to the mouse. Here is how I fixed it:
1. Open a terminal window and type
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amixer controls
2. Make a note of the slider for the Master Volume. For me it was
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numid=14, iface=MIXER, name='Master Playback Volume'
3. Now open /root/.retrovolrc. This is a hidden file by default, so you have to click on the "eye" icon in ROX-Filer to display it.
4. With the file open in a text editor, scroll down to where it says
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#tray_control=37
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#tray_control=37
tray_control=14
6. Go to the Puppy menu and, in the Multimedia fly-out, select Retrovol to re-start it
Your volume control should now actually work! Shame it doesn't have a mute control but that's hardly a major problem