Yamaha DSP-E300 Service Manual?

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The block diagram in the owner's manual calls out a six-way volume control, which confirms to me that it is a digital thingy since the volume control on the front panel has 3 wires to it. what sorts of waveforms should I be looking for when the volume is turned? I am guessing some consistent combination of highs and lows, corresponding to a changing audio 'line' level signal voltage to the preamp section... right?
 
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