It will be in a digital domain - yes.
Couldn't tell you the bit rate, or if it's 16,18,20,or 24 bit.
I beleive the newer XV's are much the same sunth engine, but have twice the number of voices (128).
I do know that the smapled data for the waveforms/sounds is compressed, so even if you managed to get it before the DAC, the sound will be 'compremised'. If it sounds okay to your ears why worry?

I have yet to hear a XV myself, but I;ve heard the JV1080/2080. I personally didn't think they were that noisy.

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