Core Audio Internal Compression?

[Michael Zacherl]

To end those discussions for good and all, which are rich of FUD and false information on other places.
I'm certainly not in a dilemma and I'm really astonished how many people, who, I thought should know, actually don't know!
And I'm _not_ talking about amateurs and kiddies!
The origin of this discussion comes from the fact that people "suddenly" experience distortion when using external audio interfaces
when running their patches.
But there's nothing more than speculation and incomplete/imprecise information going around.

Since you said it's there, I know you got a new MBP, what version/model is yours?
I was looking at Apple's developer manuals regarding Core Audio, I can't find anything there, which is good,
since I also think it's part of the audio device (i.e. driver).
But, alas, so far I couldn't find any definite statement from Apple where they talk about this feature.
cheers, m.

On 8.7.2012, at 08:22 , Jay Vaughan wrote:

> Why is it so important to you?  Just get an external audio output (USB or whatever) with proper line level outputs and end the dilemna.
> 
> j.
> 
> 
> On Jul 7, 2012, at 8:28 PM, Michael Zacherl wrote:
> 
>> I just returned from rehearsal and I checked with Eric's MBP (v 6,2).
>> A 200Hz sine wave, played from Max/MSP, the clipping becomes audible
>> at an amplification of about 1.02 via the built-in output.
>> My v 3,1 MBP only has a 16/20/24-bit resolution setting for this output.
>> 
>> First, there's absolutely no audible difference between between our MBPs,
>> second, there's no audible difference between the 24- and 32-bit settings on Eric's newer MBP.
>> 
>> Since the maximum volume setting on our MBPs is very loud we used the tape-input of my Mackie 1642-vlz,
>> and used its headphone outs to reduce the volume to a comfortable yet loud level.
>> We tried back and forth, even using skipping levels via a Preset object in the Patch, same behaviour.
>> There might be something, since this is different hardware, but this wouldn't be revealed with this simple setup,
>> and really didn't give us the impression of the effects you mentioned and others describe on the sc-user-list.
>> Maybe even Eric's MBP is too old?
>> Michael.
>> 
>> On 6.7.2012, at 10:12 , Jay Vaughan wrote:
>> 
>>> Can't believe Joost hasn't pitched in yet:
>>> 
>>> http://jstsch.com/post/improve_osx_internal_audio_output_quality
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>> 
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> ;
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> Jay Vaughan
> 
> 
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