Re: [LAU] Line noise

Hi,

Am Samstag, 20. Oktober 2007 schrieb Leslie P. Polzer:
> > 1) There is an electrical difference between mic- and
> > line-inputs/-signals. It is _no_ wonder it sounds strange and distorted.
> > You have to use a line-input or even better an instrument input. And the
> > SBLive has line-ins as well and they are usable with jack.
> So running jackd with default ALSA backend settings (i.e. hw:0) just
> provides the Mic in as capture ports?

No, it gives you the standard record-input of the AC'97. In the hardware mixer
you can select any channel for recording.

> > And with a LiveDrive you get even more...
> What's that?

An additional 5.x" device that connects to the soundcard and provides more
inputs and outputs: 2x stereo line-in, 1x phones out (also center/sub), 2x
digital in and out (spdif and optical) and one mic-input. And midi-io...

> > The best bet is to use some external (guitar-)effect that has
> > instrument-in and line-out and connect that line-out to the line-in of
> > the soundcard.
> Can't I use a software noise gate or other software filters?
> What's a piece of hardware got that I can't do with software?

You can't change the (electrical) impedance and its resulting distortion in
software. That is why you need some hardware. If that effects-box you use has
an additional noise-gate and/or compressor you are of course free to use
it. :-)

> > And if you use hw:0,3 for playback and hw:0,2 for record in jack you get
> > 16 ins and outs and you only have to find the right ones (with
> > meterbridge for example).
> Why are there 16?

Why not?

It provides more ports than there are in hardware because some of the channels
are the ones leading to and from the dsp. Which you can try to program with
linux-tools too.

> And is there a way, read program, to show all available ALSA devices?

qjackctl lists all devices. "aplay -L" lists all devices.

Arnold

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