[Gta04-owner] Turning on microphone produces loud audio feedback

[Radek Polak]

On Sunday 27 of November 2011 00:02:12 Radek Polak wrote:

> Hi,
> always when i try to turn on microphone, e.g. with
> 
> amixer set 'Analog Left Main Mic' cap
> 
> it starts giving very loud audio feedback. I suppose that for GSM call i
> need to have both earpiece and microphone turned on. Is there a way how to
> avoid this feedback? Or could someone give steps how to make GSM call with
> working input and output at the same time?

I have lowered the volumes in alsamixer and the feedback is gone now. It seems 
that the sound for gsm calls in now also working quite nice.

Now i would like to replace the command [1] that routes sound between sound 
card and umts with something better. I read that it can be pulse audio, but 
maybe something more lightweight would be nicer - yesterday i played with jack 
- it can connect various inputs and outputs. On PC it worked nice - i could 
connect capture and playback on my notebook and i heard the feedback - which 
IMO indicates that it works. But on gta04 qjackctl does not work - i can click 
any of GUI buttons.

Regards

Radek


[1]
arecord -fS16_LE -r8000 | aplay -Dhw:1,0 &
arecord -Dhw:1,0 -fS16_LE -r8000 | aplay &