I'm a big fan of Burgertime on Colecovision. I always wanted to emulate the arcade version in FBAlpha, but never got around to it.. until the other day. After finishing the emulation, I was rather sad to find out that the game has a horrible and incredibly irritating hissing noise in the background of the games' music... The noise was somewhat reminiscent of those huge old tv's, but times 100 in volume.
I spent almost the entire day trying different things to get rid of the hissing noise... Since I like to take the hardest route(s) first - I tried filtering the commands sent to the ay(8910).. no luck, then doing some hacks to the ay core itself... even more "no luck.". Finally came up with using a gang of lowpass filters to do the job. Yay, the game is now playable without a migraine-inducing headache caused by high-pitch hissing. Here's some pics for now...
best regards,
- dink