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 Post subject: MMC5 sound mixing
PostPosted: Mon Feb 16, 2015 7:00 pm 
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Location: New York, NY
The MMC5 sound docs do not discuss how to mix the MMC5 sound channels with the standard ones. Any suggestions on how to do the mix?


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 Post subject: Re: MMC5 sound mixing
PostPosted: Mon Feb 16, 2015 7:20 pm 
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What's ambiguous about
Sound output is equivalent in volume to the corresponding APU channels, but the polarity of all MMC5 channels is reversed compared to the APU.
?


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 Post subject: Re: MMC5 sound mixing
PostPosted: Tue Feb 17, 2015 11:11 am 
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Thanks. I guess I was looking for a math formula with the right constants, but that single line seems to convey what to do.

On a related topic, are the MMC5 sound channels disabled in the US version of Castlevania III? Or, more importantly, are the standard 5 channels used differently in the US vs the Japanese version? Meaning, even if they could be enabled, should they be enabled in the US version?


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 Post subject: Re: MMC5 sound mixing
PostPosted: Tue Feb 17, 2015 11:54 am 
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The sound output of the MMC5 isn't physically connected to anything for Castlevania III.

In software the sound is enabled through $5015. Two minutes with a debugger determines that Castlevania III doesn't write to $5015. So, if you initialize your MMC5 sound enable to off, there is no special concern that Castlevania III will turn it on and start playing rogue audio through the unconnected lines.


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