On Sat, 16 Apr 2016, Grant Frank Burton wrote:

my problem is there are too many mixers I think...... If I open the QasMixer and
select the input I want to use and make sure the capture is selected. Then open
ardour and it works most of the time.... most of the time.

QASMixer is for setting up the sound card levels and enabling them. pavucontrol (sound settings on the audio drop down) controls only desktop audio. Ardour can use either ALSA directly (cuts off all desktop audio BTW) or Jack (controlled with qjackctl) which can have desktop audio routed through it at the same time as Ardour is running if desired.

I don't think a normal user would find that......

there are three cards in my system
0 HDA Intel
VIA VT17085

1 HDA ATI HDMI
ATI R6xx HDMIHDA ATI HDMI

2SAA 7134
SAA7134 MixerHDA ATI HDMI

often the output is sent to HDA ATI HDMI but there is nothing plugged into 
there.

Output from what? Desktop? In the case of desktop audio, open pavucontrol select the configuration tab and turn the profile for ATI HDMI off. PA will then ignore that card.

If you mean in Ardour, select the correct card in either Ardour (if using alsa) or in qjackctl (if using jack) both will remember that card for next time. My prefer running Ardour with the jack audio back end. (I have only run Ardour with alsa selected for a quick trial to see if it works)

Personally, I turn all profiles off in pavucontrol and let the desktop audio flow through jack. I start jack at login and run it all the time. Do be aware that some desktop applications (skype is known for this) require a higher latency in jack to work. I have not been able to get skype to work at less than 512/2 in jack. In my opinion this is a bug in pulse modules jack_sink/source. I have not had trouble running most other desktop applications at lower latencies though (64/2 or 128/2).

Other people run one audio card just for desktop (with it's own amp/speakers or to another mixer input) and another card just for Jack use. This was quite common before firewire code was added to alsa.

--
Len Ovens
www.ovenwerks.net


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