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What's the audio 'word' size between VEP7 and Master?
Last post Fri, Mar 26 2021 by Macker, 4 replies.
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Posted on Mon, Mar 22 2021 15:54
by Macker
Joined on Tue, Aug 21 2018, London, Posts 240

I seem to recall - only vaguely - reading somewhere in VSL literature what size the audio 'word' is that's being streamed from VSL Player outputs in VEP7 to the receiving devices in the master DAW. But I can't remember what it was and I can't find it anywhere now.

Is it 24-bit integer, 32-bit floating, or something else?

At the very least I need to know if it's more than 16 bit integer (though I think it must be). This is because I want to set up all VSL players in VEP7 at a nominal static gain and leave them at that setting permanently; then I'll do all non-timbral level conditioning and controlling (including Expression level, instrument levels, etc) within the confines of Logic. Of course I don't want to exceed the intrinsic maximum audio level anywhere in VEP7 (including within VSL Players in VEP7), so knowing the audio word format (in terms of its numerical range) is crucial.

 

[In the idea I'm pursuing here, I need purely objective numerical hygiene for audio in VEP7 while the crafting of expressive and other subjective dynamics during audio tracking and mixdown is kept locally within Logic as much as possible. Hence the only audio level changes I want in VEP7 are those which necessarily result from velocity changes, velocity-layer X-fading (which is the only level change I need Logic to manage remotely), recorded-sample dynamics. or baked-in sample level differences. If the audio word size is at least 24 bit integer, or perhaps 32-bit floating, etc, then I don't have to worry much about peak signal levels going quite far 'into the red', nor average signal levels falling quite far below what the meters can display, within VEP7 and its inserted VSL Players. I won't be using any level-dependent Fx plugins inside VEP7.

If this all sounds a bit like laziness, well, perhaps I'd admit to favouring economy of effort in this case, lol. But my main rationale is, I'm determined to avoid fixing door handles onto door handles fixed onto door handles ....]

Posted on Tue, Mar 23 2021 17:40
by Macker
Joined on Tue, Aug 21 2018, London, Posts 240

Crickets. Ok well I'll proceed on the assumption that VSL Players and VEPro operate internally with 32-bit floating point like Logic (without 64-bit summing switched on), and since I'm not using Ethernet links I'll also assume that's what's received by Logic from VEPro. I'll just have to raise a ticket if I run into trouble with these assumptions.

Posted on Fri, Mar 26 2021 11:03
by Paul
Joined on Sat, Aug 03 2002, Vienna, Posts 12640

Hi Macker, 

I asked our development team: There is no yes/no answer to be had, different operations operate with different resolutions. 

Best, 
Paul

Paul Kopf
Product Manager - Vienna Symphonic Library
Posted on Fri, Mar 26 2021 13:18
by Macker
Joined on Tue, Aug 21 2018, London, Posts 240

Paul, thanks for investigating. I had a sneaky feeling that situation might be the case - it's not a problem, I trust the devs.

My tests have been unable to produce hard clipping anywhere in VEPro when I've pushed audio hard into the red - at much higher levels than I'm ever likely to encounter in normal practice. Now I can set up, save as presets and forget about my permanent default gain levels in Players and VEPro with no worries.

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