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does anybody know how DMC PCM Modulation (reg $4011 poke) works?
I turn it on using cc13, and tweak cc02 but nothing happens

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After its turned on using cc13, your literally writing directly to the DAC. So you need to send it audio rate CC data, like an audio bit stream. For more info on the way $4011 works checkout nes_sound_apu.txt, should be on the nesdev site.

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Fargo

I'm not sure I understand.  Is this used to play samples from the NES?

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thanks Chris
I found it here if anyone's interested
http://nesdev.parodius.com/apu_ref.txt

It sounds a bit complicated for me
I'm building a MIdines desktop unit with the NES pcb, cart pcb and MIDIbox  modules with buttons/LED's/knobs for all features of Midines
I'll leave this feature out though smile