Sound cards (Was: Re: no sound

[Ralf Mardorf]

On Fri, 2011-05-20 at 14:04 +0200, Thomas Orgis wrote:
> Am Fri, 20 May 2011 13:54:57 +0200
> schrieb Ralf Mardorf <ralf.mardorf at alice-dsl.net>: 
> 
> > When recording soft synth just by
> > JACK, without the sound cards being involved, there's a loss for the
> > sound quality too!
> 
> Wait a minute... could you explain that? You have a loss of quality compared to live playback of the soft synths (using JACK?) when playing back a recording taken from JACK? A recording that preserves 32 bit floating point sample format (heck, or 24 bit integer) and the sample rate, of course?

Yes and other people who can't hear it, do have it too. You can see it
by watching the waves spectral by Audacity. I did this regarding to a
zero-copy issue, that appears if a Jack client is connected directly to
itself, e.g. to do the mastering. 48 and 96 KHz, 32-bit wav 32-bit
float.

> I have to wonder what you did there to alter the data from the soft synth. I mean ... we're talking bit-exact copy here, aren't we? Can you present a test setup to observe that issue?

Any Linux install I know, e.g. 64 Studio 64-bit 3.0, 3.3, Suse 64-bit
11.2 and Edubuntu 32-bit Maverick + Ubuntu Studio meta packages and
others! If you can't here it, try to see it. If you don't have this
issue too, some people claim that they get 100% correct digital copies,
then something on my machine might cause a software issue, but I don't
think so.

Ralf

> 
> Alrighty then,
> 
> Thomas.