[linux-audio-user] Re: hardware mixing

Paul Davis paul at linuxaudiosystems.com
Mon Jan 22 22:10:32 EST 2007

On Mon, 2007-01-22 at 21:13 -0500, Lee Revell wrote:
> On 1/22/07, ram <ram at hydrophones.com> wrote:
> > I can confirm the RME HDSP 9632 cards and add-ons also support hardware mixing.
> > They work really well too I may add.
> I stand corrected.  Mark was right - these devices do have hardware
> mixing, they just implement it in an odd way, probably to keep the
> interface similar to other OS.

its not true to say that with ALSA, they support what is commonly
understood as h/w mixing. you cannot do independent open's of several
subdevices and get the output of each subdevice mixed down to the

yes, they do have a very powerful h/w matrix mixer, but it is not
accessible via a series of independent subdevices. it also is not
supported by the ALSA mixer API at this time.


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