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Dual PCM

#16 User is offline MarkeyJester 

Posted 29 March 2017 - 11:14 AM

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Yeah, I know about that (in fact, my name is plastered all over the thread! Yay! =D).

The issue though, is that by enabling this, you convert all FM channels into a DAC channel each, unfortunately, they reference from the same 8-bit port, meaning that they playback exactly the same sound, so there's no variation. But, in regards to the "panning" trick oerg pulled by manipulating the left/right speaker on/off of each channel. Is that, firstly, this will control all sounds flushed in so both PCM channels will be panned the same, rather than individually, though it's still better than absolute panning. But the second issue is a real problem, the fact that it disables FM operator playback means that you are sacrificing 5 FM channels, just for some smooth panning and a slightly louder playback. The third issue, is that you will only experience this quirk on hardware as it was an unknown quirk at the time of those many of public emulators out there being released. So no emulators will support this, this heavily hinders and limits the audience.

If the two sounds being flushed could pan individually, then it may have more benefit, we could stuff the entire ROM with sample data, and flush out BGM through one, and SFX through the other, especially given that we potentially have unlimited memory on the cartridge, but again, it all comes down to emulators supporting DTAK on cartridge, to access the Mega CD and 32X memory map as cartridge space, and even memory mappers are limited on emulators. But the lack of individual channel panning (even if not smooth) would have been prefered.

tl;dr, this causes more sacrifice than the benefits it's meant to give. Sorry =o

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