Re: [linux-audio-user] Re: [Freebob-devel] Re: Help me set the volume for Freebob, please!

From: Daniel Wagner <wagi@email-addr-hidden>
Date: Sat Nov 11 2006 - 14:35:16 EET

> Well I've got it down that the hum only happens when phantom power is
> switched on... Or, more precisely, that it is a LOT louder then. It is
> the same hum I've been having with Jack for ages, only softer than on my
> internal sound card. It happens as soon as I start jack and stops when I
> stop jack and is louder the less latency there is.

Apart from the ground loop problem the other thing I can image is that
you hear you hardware 'sing'. For example, I can hear the interrupts
fired from the ohci1394 card when I start a stream.

> WTF??? How odd. Dying to get a solution, it's been plaguing me for
> years. Note: It does get softer when I used an adapter to remove
> grounding of the notebook, but it's still there. How odd.

Don't think its odd. You seem to suffer from ground loops.

> Thanks again, Daniel!

no problemo.

> PS: You don't happen to know whether the Apogee Ensemble could be run
> using freebob? If so, I am eager to test.

According the the schema the Apogee Ensemble has a DM1500 inside. I'm
almost sure that there is a BeBoB running. And if Apogee has not removed
the AV/C model it should be running fine with freebob. Hmm, thinking
about Apogee they are closely tight to Apple. This means the device has
almost for sure a working AV/C model inside. But to be sure someone has
to test it first.

cheers,
daniel
Received on Mon Nov 13 04:15:12 2006

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