some questions about Digidesign's white paper

compusic

New member
has anyone read the Digidesign's white paper " 48 bit mixer"? the link is below:
hxxp://akmedia.digidesign.com/support/docs/48_Bit_Mixer_26688.pdf

as for some points, I'm arguing with a local Pro Tools HD user, and we can not persuade each other. I have asked these questions in Digi's forum, but official response is very slow.

to make things simple, I have these question below:

1. what's the resolution of HD'S internal bus? I mean audio bus.

someone thinks that as Pro Tools' MASTER FADER can be connected with internal bus and receive data from internal bus, and MASTER FADER is a 48-bit mixer, then the internal bus is a 48-bit bus. He thinks that the MASTER FADER of Pro Tools HD functions like a master fader on a analog console, then the bus the MASTER FADER connected with is a master bus, and this master bus shoule have the same resolution as the MASTER FADER.


2. if say, set a audio track's output to internal bus 1, a aux track's input is bus 1, and set a MASTER FADER track's output to bus 1. then which one of the descriptions of the signal flow is correct?

A: audio track outputs to bus 1 first, MASTER FADER receives data from bus 1, and processes the signal as needed, including level adjusting, then output to aux track.

B: MASTER FADER receives data from audio track, and processes the signal as needed, including level adjusting, then outputs to bus 1, the aux track receives data from bus 1.
 
one more information. I just figure out how the other guy thinks about the relationship between Pro Tools HD's MASTER FADER and internal bus.

He thinks the MASTER FADER shoule behave like a fader on analog console, that's fader's input must be connected to a bus.

But I think in HD, the situation is quite different. the HD'S MASTER FADER's input, in fact, is not connected to any HD'S internal bus, the MASTER FADER just receives data from different sources, if there's any bus here on the MASTER FADER'S input side, we should say MASTER FADER creates a virtual bus which is different from HD'S internal bus. for example, track 1, 2 and 3 all output to bus 1, and when MASTER FADER's output is set to bus 1, then MASTER FADER breaks the direct link between the tracks and bus 1. MASTER FADER receives all 3 tracks' data on its input side where we could say there's a virtual bus created, then MASTER FADER output the summed data to bus 1.

whose opinion is correct?
 
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