I got tired of my street fighter 2 cps1 arcade board sounding muffled. Followed the audio traces, disconnected all the low pass filter caps I could find.
Yes it's a legit board. I have another unmodified legit board that I can use I'll make a before and after video. This particular board started out as an ebay sf2 turbo pcb that I got for cheap. I made a custom hack for it, and now redid the audio circuit.