[LAU] Q: does jackd mix?

[Jack O'Quin]

On Mon, Oct 26, 2009 at 2:07 PM, Jonathan E. Brickman
<jeb at joshuacorps.org> wrote:
> 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