[LAU] Line noise

[Arnold Krille]

Hi,

Am Samstag, 20. Oktober 2007 schrieb leslie.polzer at gmx.net:
> I'm trying to get my electric guitar connected to my sound card.
> Keeping the card's input gain low keeps away the noise, but
> produces a very low signal. I can put Jamin right after that and crank
> up the input gain, but there's a maximum to it and I'm not sure whether
> that's the right approach.

Jamin is not the right tool for playing live through it. It has a builtin 
delay of >10ms which adds to jackd's latency. Use jack-rack for the effects 
you want.

> Turning up the card's input volume increases the gain, of course, but it
> delivers a lot of very ugly noise as well. If I connect a microphone to
> the port, I get a high-gain signal without noise.
> The card's an SB Live! Platinum, and the mic port seems to be the only
> capture port usable by Jack. The cabling for the guitar is all new.

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. And with a LiveDrive you get even more...

2) The mic-input on the SBLive might be better than a mic-input on 
onboard-cards but it is still crap.

3) Guitars do output a lot of noise. That is way the combo-speakers have a 
limited frequency-range. :-)

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.

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).

Hope that helps,

Arnold
-- 
visit http://www.arnoldarts.de/
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