What 'Rendering' bit depth should I be using?

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DeeringAmps
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 14:03:40 (permalink)
So if I have a plug on the 2 Buss the Trim is important (assuming I'm overloading it).

If not I can pull down the Fader until I'm in the -3 to -6db, or whatever level I'm happy with on the 2 Buss.

Thanks for that.

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bitflipper
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 15:49:32 (permalink)
Set the Trim (Gain) control before you start adjusting any master bus compression. Since I typically have only Ozone on the master bus I'm in the habit of using Ozone's own Input fader instead. It's the same result either way.

It's rare nowadays to come across plugins that distort when driven hot. If you hear distortion, it's most likely coming from your audio interface rather than anything inside the computer. And that won't happen as long as you keep the final output of the master bus out of the red.

Keeping the incoming level under control isn't just about avoiding clipping. It also assures that your limiter has enough breathing room to do its thing.


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DeeringAmps
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 16:01:49 (permalink)
Dave,
So I'm taking from this that reds anywhere BUT the MASTER buss are OK; right?

Thanks

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drewfx1
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 16:26:31 (permalink)
DeeringAmps


Dave,
So I'm taking from this that reds anywhere BUT the MASTER buss are OK; right?

Thanks


There are 2 main places where you need to be careful:

1. Whenever you leave Sonar, you want to be below 0dB, whether going out to your sound card (hence the Master bus), or if you're writing to a 16bit or 24bit file.

2. Plugins - keep in mind that plugins specifically designed to emulate analog devices may well emulate analog distortion when driven hard. But with those kind of plugins, it's not so much "what technical/measured level" as "what level sounds best". Also dynamics processors are level dependent by nature, so you need to send them an appropriate level (if they don't have their own input level or if the threshold can't be set high enough), or else you'll overcompress everything. And a few plugins will actually clip at 0dB.

 In order, then, to discover the limit of deepest tones, it is necessary not only to produce very violent agitations in the air but to give these the form of simple pendular vibrations. - Hermann von Helmholtz, predicting the role of the electric bassist in 1877.
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DeeringAmps
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 16:28:50 (permalink)
Drew,
Much appreciated...
Thanks

Tom Deering
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BenMMusTech
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 19:39:34 (permalink)
Not trying to be contentious here, but this goes against everything I think I know about digital. What I think I'm taking away from this is that as long as the "overs" do not hit the DA converter I'm good? Ben are you sure the "warmth" you hear isn't just due to the signal getting louder? Make it louder or brighter; right? I know this is apples to oranges here but I'm sure the "warmth" that we think we hear in valve amps is caused when the circuit is pushed past the point of linear response (in general BEFORE clipping, its guitarists generally, not audiophiles, that enjoy the clipped signal). I think (and I could be wrong) that the "sound" of some "classic" analogue (assuming here that Ben is from Brittan and enjoys the "colour" added by classic analogue gear) desks is actually their non-linear defects. I've seen a video interview somewhere with one of the designers at SSL (I think I'm right) that the desk was terribly "flawed", phase issues, etc., but sounded "great". Again, I'm not trying to be contentious, but I just don't accept that digital overs are going to respond like saturated tape, or discrete analog components. That just flies in the face of what I "think" I know about digital. Fellas?
DeeringAmps



BenMMusTech

A couple of things though, the real benefit of 32 bit is mixing in the box, what 32 bit does is give us back our headroom, just like an anolouge mixing desk.  What this means is as long as the signal or the program audio does not touch the converters some digital overs, not always in the red is now acceptable.  Ok why is this good? as we know driving an anolouge mixing desk produces at times pleasing results, why this may not be the case with our DAW's the best part of a digital waveform is the actual very tip, so if we want to get the warmth of a recording we have to have a fairly hot signal (just have a listen to a bass or a drum kit with an 1176 plug and push that baby into the red, just and you will hear what I mean), we then use the trim tool to adjust the iput of each channel, this is the biggest fundemental thing that a lot of people don't understand you want the average level of each track to be relative and this means somtimes you will push the program audio into the red but as  I say this is not a bad thing anymore, no matter what anybody else is saying.

Not trying to be contentious here, but this goes against everything I think I know about digital.
What I think I'm taking away from this is that as long as the "overs" do not hit the DA converter I'm good?
Ben are you sure the "warmth" you hear isn't just due to the signal getting louder? Make it louder or brighter; right?
I know this is apples to oranges here but I'm sure the "warmth" that we think we hear in valve amps is caused when the circuit is pushed past the point of linear response (in general BEFORE clipping, its guitarists generally, not audiophiles, that enjoy the clipped signal).
I think (and I could be wrong) that the "sound" of some "classic" analogue (assuming here that Ben is from Brittan and enjoys the "colour" added by classic analogue gear) desks is actually their non-linear defects.
I've seen a video interview somewhere with one of the designers at SSL (I think I'm right) that the desk was terribly "flawed", phase issues, etc., but sounded "great".
Again, I'm not trying to be contentious, but I just don't accept that digital overs are going to respond like saturated tape, or discrete analog components.
That just flies in the face of what I "think" I know about digital.

Fellas?
No if you read my original statement I said driving the digital signal in the box WONT give you the same sound as driving a anolouge desk, its more to do with what is the most useable part of the recorded audio.  I have an article that Micheal Stavro wrote about it (I will track it down and explain better if you want).  The other thing is that if we are using modeled plugs such as the 1176, if they are behaving in the way that the original or the "real" version would then driving the plug into the red should result in a similar sound.  I know that this flies in the face of what people know of digital but, this is a bright new shiney world and "what we know about digtal" is very little.
 
Finally bitflipper is right, always trim the main buss although I am not in agreeence with his peaks, between -6 and -3 is the optimum level for digital (as I say the best part of digital or where to find all the harmonics and good bits is at the tip of the peak) and this is the kicker an rms value of around -18db of course different levels for different styles of music.  Also you can trim the other buss's so the mix fits better.
 
Ok I will find the information about 64 bit, but to surmise which I should have done last night, it is my understanding, that what freddie was saying and from my understanding of the link to the blog which I have read is that if everything is at 32 bit or 64 bit it eases the strain on all the computing parts, this includes hard drives, memory and CPU, what the blog is saying is because there is no upsampling or downsampling or bit conversion going on, it frees up computer power.  But what the blog also said was that whilst there was some improvement in the overall performance, it was negligable and hard to qualify that benifit, or that is how I read it.

Benjamin Phillips-Bachelor of Creative Technology (Sound and Audio Production), (Hons) Sonic Arts, MMusTech (Master of Music Technology), M.Phil (Fine Art)
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bitflipper
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 19:54:07 (permalink)
I am not in agreeence with his peaks, between -6 and -3 is the optimum level for digital (as I say the best part of digital or where to find all the harmonics and good bits is at the tip of the peak

If you trim to -3db, then your limiter has less than 3db of headroom to work with. No matter how smart it is, it can never offer more than 3db of adjustment. That makes for a very dull-sounding master. Leave 8db or more and adjust the limiter's threshold accordingly and now you have at the potential for transients of 8db or more in amplitude above the ambient level, resulting in a punchier mix.


All else is in doubt, so this is the truth I cling to. 

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ampfixer
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 20:30:45 (permalink)
Bitflipper this is interesting stuff to me. My tiny brain is rooted in ancient analog tech and so is my understanding of distortion. Analog vacuum tube distortion can be wonderful to my ears due to the soft clipping and natural compression inherent to this technology, but any digital distortion sound like a malfunction to me.

My settings are very much inline with what's been discussed, but my recording methods are from the tubes and tape era. Run everything right up to the edge of clipping 0 db. I think a light is flickering to life here. It sounds like I should really be aiming for -12 to -6 db. I can then mix using my plugs of choice to get a nice dynamic range and more separation between the instruments without ending up with a confused, mushy mix.

Am I reading you right on this one?? Many thanks folks.

Regards, John 
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BenMMusTech
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Re:What 'Rendering' bit depth should I be using? 2011/07/04 22:09:38 (permalink)
bitflipper



I am not in agreeence with his peaks, between -6 and -3 is the optimum level for digital (as I say the best part of digital or where to find all the harmonics and good bits is at the tip of the peak

If you trim to -3db, then your limiter has less than 3db of headroom to work with. No matter how smart it is, it can never offer more than 3db of adjustment. That makes for a very dull-sounding master. Leave 8db or more and adjust the limiter's threshold accordingly and now you have at the potential for transients of 8db or more in amplitude above the ambient level, resulting in a punchier mix.


Hey bitflipper I will clarify, whilst I still say -3db for the absolute peak, I would not want it there all the time, my prefered level is between 6 and 3 and we only hit 3 a handful of times in any one song.  I think the more important figure in all this is the RMS value and this is something that has been lost in the digital revolution.  If you have all the RMS figures right accross the mix, then between minus 3db and 6db is all the headroom you need, as I say -3db is the absolute celing and so therfore should only be touched by the tallest peaks.

Benjamin Phillips-Bachelor of Creative Technology (Sound and Audio Production), (Hons) Sonic Arts, MMusTech (Master of Music Technology), M.Phil (Fine Art)
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GIM Productions
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Re:What 'Rendering' bit depth should I be using? 2011/07/05 03:40:56 (permalink)
Hi all,with respect for all points of view,i believe that is a little bit confusion in the DbFS and RMS.
I have noticed that sometimes complicates the process.
In all prjs i use a K system meters on master bus with -14db equal 0 db setting and - 6 db peak value on master bus mix.
I can have huge headroom for mastering session to preserv all transients and all distortions with mix plug ins.
In mastering session i can decide if put some stuff to warm the mix safely.
This is one of the advantages in the digital world.

Greetings

Roby
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cake2010
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Re:What 'Rendering' bit depth should I be using? 2011/07/05 06:26:28 (permalink)
With all due respect there seems to be confusion about digital/analog mixing, headroom and gain staging. If you are not sure about these, maybe it´s better to not add more confusion..
(you=anyone who think they almost get it)
post edited by cake2010 - 2011/07/05 06:36:05
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DeeringAmps
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Re:What 'Rendering' bit depth should I be using? 2011/07/05 09:20:36 (permalink)
cake2010


With all due respect there seems to be confusion about digital/analog mixing, headroom and gain staging.
This is not something "new" or limited to the "digital" age.
I was listening to "Do Wah Ditty" over the weekend and the vocal (this was on the radio) seemed pretty "hot" to me.
I'm guessing the VU was slamming on that session.
I'm all "ears", please enlighten us...



Tom Deering
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cake2010
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Re:What 'Rendering' bit depth should I be using? 2011/07/05 12:36:01 (permalink)
DeeringAmps
This is not something "new" or limited to the "digital" age.
I was listening to "Do Wah Ditty" over the weekend and the vocal (this was on the radio) seemed pretty "hot" to me.
I'm guessing the VU was slamming on that session.
I'm all "ears", please enlighten us...
 
It sure isn´t something new.
I think I know enough but I don´t know sh!t :) GS-forum has some great stuff worth to read from real maestros. 
 
btw, you have a good comment: "... but this goes against everything I think I know about digital."
Too often it´s "... hey thanks for the great advice, you are probably right" 
 
 


#43
bitflipper
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Re:What 'Rendering' bit depth should I be using? 2011/07/05 16:06:19 (permalink)
...my recording methods are from the tubes and tape era. Run everything right up to the edge of clipping 0 db

Exactly - this is the legacy we old timers have to let go of in the digital world. There is no benefit to recording or mixing close to 0db, only lots of dangers.

Pushing the envelope on tube gear and tape machines helps S/N ratios, yields pleasant-sounding distortion, and helps glue the mix together. Pushing digital audio up to the brick wall just sounds nasty.



All else is in doubt, so this is the truth I cling to. 

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