Well, I would argue, that if someone wants the whole story, theres no
real need to keep it a secret!
The SB (and Transporter) volume controls work on the digital signal,
before it goes to the DAC.  The usual problem with this, is that as you
turn the volume down, you decrease the number of bit's in the digital
word, and thus increase the distortion in your signal.  This is why
some people (myself included) have a phobia about digital domain volume
control.  In the case of the SB though, they've been clever.  By using a
24 bit DAC, to convert 16 bit CD data, they've bought themselves 8 extra
bits to play with.  The software controlling the volume makes sure that
no bits are lost until you get to ~40.  You will get a decrease in
Signal to Noise ratio as you turn the volume down, but you don't get
distortion due to lost data bits.

Hope this helps!
Dave


-- 
DCtoDaylight
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