Thanks for all the input, it's helped me out quite a bit I've learned a lot about mame the last few days, hopefully I can make some useful contributions in the future.
I didn't much like changing the clock on the MIRAC like that and felt it was probably wrong which is why I posted it here first
I don't have gticlub anymore so I can't provide good recordings. There is a PCB recording posted above from gradius 4 but it's not the best example (though for timing purposes it's a great example). You can hear the difference though, reverb vs lots of release and decay which exacerbates a few of the audio issues the driver still has. Not to mention is just sounds bad and is pretty much a hack. It's most noticeable on thrill drive on the car select screen and the coin up sfx. It would be good to get a line recording of thrill drive for comparison. I may source a board to do just that.
I didn't notice how the envelopes were timed though. I'm running mame at the default 48khz.
http://www.youtube.com/retrorepair
Edited by RetroRepair (01/29/13 11:20 AM)
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