OK, worked on this all yesterday afternoon into early hours. Lots of experiments.

What I have done so far and iit has produced good results. This is just sorted sound code, have not touched anything else yet.

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/ Optimise pspuae sound to MIPS Complete /
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Media Engine audio mixer thread implemented
Paula mixing moved off main CPU to Media Engine
Ring buffer implemented between mixer and PSP audio

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This was the last release back in 2014. Since then I have not been able to get it to compile.
However this afternoon. Finally got it compiling with latest GCC and toolchain.

So with that said, expect work to continue on PSPUAE, .
Only issue I can see at present with updated source, is the LEDs are messed up. Still working on fixing them.

Just to let you all know. Site has been neglected for last few years.
I'm planning on reviving site. So it may be up and down over next few days.

Lets hope 2023 is better than last year. As the last year has proved, we all need each other. So lets hope the fighting all stops before we destroy ourselves.