linuxaudio.org

On 07/18/2010 09:46 PM, Andrew Bryant wrote:

quoted text
> If I use qjackctl to start jackd, the connect window shows two capture

> ports and two playback ports.

>

> I can then start a pair of meterbridge dpms, and connect their inputs

> to the capture ports.  Signal applied to the mic jack then shows up on

> the meters.  So I deduce that the capture ports are related in some

> way to the mic jack.

>

They are capturing whatever is being sent to the internal digital input

of the device. So anything you have enabled in the mixer settings [line

in, mic, cd] will be heard in jack.
> If I connect between the capture ports and the playback ports, should

quoted text
> I then expect the signal to be present at either the headphone or the

> line output jack?

>

Yes, if you have unmuted the master output and turned up the pcm

channel. Some cards also have additional input controls that need to be

tweaked.
> And (this may actually be the same question), the soundcard has

quoted text
> numerous analogue inputs (mic, line, CD), at least two outputs, not to

> mention whatever the mechanism in the digital domain is to relay

> internet radio etc.  Can they all appear as ports in the qjackctl

> connect window?  Is there some special imprecation needed when I start

> jackd?

>

This is dependant on the card. If it is a multichannel device then you

may see multiple inputs but for most(all) consumer cards the inputs are

mixed at hardware level and presented as one (stereo) to jack.
--

Patrick Shirkey

Boost Hardware Ltd
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