Subject: Re: [LAU] Q: does jackd mix?

From: Jack O'Quin <jack.oquin@...> · Date: Monday, October 26, 2009 - 7:20 pm

On Mon, Oct 26, 2009 at 2:07 PM, Jonathan E. Brickman

 wrote:

quoted text> OK, perhaps a stupid question:  does jackd mix?  In other words, let's

> say we have two or more audio applications outputting to Jack; will Jack

> mix the streams?  Or does it send them each independently to the sound

> driver?
Well, yes.  The mixing is done on a port-by-port basis.  Whenever

there is more than one input connected to a JACK port the

corresponding samples are added together.
This can produce float values greater than 1.0, which will overflow

when routed to a physical output device.  But, there are many JACK

applications that allow you to adjust output levels.

--

 joq

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