Had a reply from Matt at Pimoroni with a link to the retropie forums:
but it seems the posters there want to do what I want to do! ie at this point just control the sound without shutting down a game!, but as I’ve found there’s no real solution to be had.
If someone reading this has followed the link and understands what to do could you give me a hint.
I spent most of my free time over the weekend trying to get some kind of button mapping to control the sound but I get no where.
I’ve tried installing retropie without adding the pimoroni software for the Picade Xhat but obviously I had serious button & joystick mapping issues, I did get them to work (sort of), so I’m back where I was there doesn’t seem to be a great deal of support for the Picade from Pimoroni for this issue.
My next plan is to buy the zero lag arcade controller (in my link in a previous post) and get an on off button for the Pi ,wire in a mono ring tip jack plug to the Pi’s audio out jack and a log pot to the speaker and see what happens then, as in this link I found:
it shouldn’t cost too much to do either as I have most of the bits.
I’d like to ask if anyone reads this and knows how, how do I alter my Original Post title from " Adding an External Volume Control" to something more descriptive as I now realise I’d be really happy to settle for easier sound control on the Picade, and people on the forums may not be looking at my post because adding an external volume control isn’t for them.
Thanks for reading.