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Old 11-15-2007, 08:37 PM   #1
Registered: Dec 2005
Distribution: Mandriva 2006 x64
Posts: 161

Rep: Reputation: 30
How Do I Capture Live Audio Directly From A Soundboard?

What I'm trying to do is capture a live audio stream directly from a soundboard.

I have installed studio 64(I think the distro doesnt matter as much as the program to use)and tried audacity.

I have made a cord to plug into the mic jack on my machine and audacity does in fact record the incoming audio but i'm getting an unacceptable amount of noise recorded also.I have tried lowering the source volume but the buzz is proportionate to the incoming audio stream volume.

I have tried several other recording apps that are in studio64 but when I try to start them I get an error message saying "Jack server not running" which brings me to my next question.....How do I start the jack server?

Any help in achieving my goal of saving a live audio stream to hd would be greatly appreciated.

Old 11-15-2007, 09:26 PM   #2
Registered: Nov 2007
Location: South Australia
Distribution: Ubuntu 11.10
Posts: 81

Rep: Reputation: 23
Well, all I know about is recording from an external source using Audacity. I don't know what you mean by a soundboard, but I'll mention a few things, which may seem obvious but I don't know what you have tried so far. It would appear to be a physical audio issue rather than a software one. Is it appropriate to be using the microphone input? This is a very sensitive input and could well be overloaded unless you are really using a microphone. Some tests to try:

1. If you are using line out from your source then you must use line in to your PC. You can also use the soundboard headphone out (if it exists) but you need to keep the soundboard volume right down to avoid overload.

2. Try a microphone on the microphone input to eliminate possible problems with the PC.

3. Try another source such as a radio/CD player with the line input.

3. Can you tell if the buzz is around 60Hz or 120Hz (50/100 in other countries)? If so, then there is likely a problem with hum, which is fairly common when dealing with PC recording. You will then need to deal with this issue separately - there should be plenty of ideas on the Web. Possibly isolating the mains to the soundboard will be necessary. If your mains connector has an earth pin, then that may be an indication of possible earth loops. However do not try removing any mains earths on equipment lest you kill yourself.

cheers, Ken

Last edited by Kenarkies; 11-17-2007 at 04:27 AM. Reason: Clarifications
Old 12-04-2007, 08:25 PM   #3
Registered: Dec 2005
Distribution: Mandriva 2006 x64
Posts: 161

Original Poster
Rep: Reputation: 30
Sorry for my absence from the forum since this post and thanks for the response.

The soundboard is very similar but not exactly like this

I plan to use one of the headphone outs to the computer.

What I did a few weeks ago was use an mp3 player with a homemade patch cord.

The buzz was in fact around 60Hz.Last nite after I upgraded the cord and moved the mp3 player(and formerly unshielded cable)from laying on top of my ultra 550 watt psu the buzz went away.Strange huh?

I'll be taking my machine to the church in the next few days and trying again with the real equipment to be used.

I'll post an update(hopefully a success story)after.

Thanks again for the reply.
Old 02-03-2008, 03:16 PM   #4
LQ Newbie
Registered: Nov 2005
Location: Greenville S.C.
Distribution: Ubuntu 6.06
Posts: 2

Rep: Reputation: 0
Hi PipeDreams,

Your biggest problem is trying to use the mic in on your sound card.
It has too high of an impedance (or resistance). It is made for special types of microphones. Use the line in instead.
The first knob on your mixing board is labeled
gain. Turn this knob up until you just see the clip light on the mixing board flash. Turn it back down until it just stops flashing. The purpose for this knob is to
accommodate different input levels. Once it is set leave it alone. Use the
sliders, or send knob to adjust the volume to the computer. You can use Audacity or sound recorder to record to the computer. In Audacity there are two green lights at the top of the tool bar. They are signal input indicators. If you see them turn red at the end of there travel, they are clipping. Go to your volume control in the computer (I double click the little speaker icon in Ubuntu) click the capture tab and bring the line level sliders down just until the green lights in Audacity tool bar stop flashing red at the end of there travel. You will now have a good signal to noise ratio. I hope this helps

God bless you in your efforts.

Last edited by rdstreets; 02-03-2008 at 03:28 PM. Reason: Sorry, I misunderstood what you were trying to do.


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