OK, so i've made Heart of China work by still using the Willy Beamish driver but i instead patched the 001, 003 and 101 PAT files by replacing the code inside with the Heart of China equivalents. It was Hex Editing work mainly but it was easy enough and the first impression is that it is working perfectly. Willy Beamish seems to have a driver for the Pro Audio Spectrum inside its SX.OVL file, but i haven't tried if Heart of China can use it as an added benefit of my hack.

OK, i managed to actually do this properly by extracting proper SX.OVL files for the various games, extract and unpack them patch the Tandy driver and then i put a compressor together with AI assistance to repack the file. Then was just a matter of applying the patched compressed driver to the OVL sound files for each game and that was it.

Only one that I couldn't figure out yet is Stellar 7 RES format. It seems like the information out there about it is slightly wrong or incomplete.