@Michael-Baudino thanks, that points to a problem outside the gsplus source... perhaps with SDL. Does Recalbox use the default SDL2 distro package or grab a newer source version? -Matt

The gsplus distro has horrible sound on the Pi 4 / Raspbian, but Recalbox manages to get it working in Recalbox 7. It looks like Recalbox is using an old commit as well as some customizations prior to compilation, but I'm not able to find where the source is being downloaded / compiled on the SD card or in SquashFS. Anyone have an idea where I might review the Recalbox gsplus source?