Trouble with interference / guitar

Never tried recording a guitar with GarageBand, so I'm new to this. Hopefully I'm just doing something wrong.
I went out and bought a 1/4" to 1/8" mono adapter, ran a line from my guitar to the line in on my iMac - had to crank input levels to the max, ... there was a lot of interference... Some of the effects were okay, but anything with distortion (the "metal" effect is the killer) is just unusable... I thought possibly it was my pickups or something causing it (?), but when I unplugged the cable from my guitar, I could still here the steady interference drone... High pitch hiss sorta
Figuring that was not the ideal setup, I purchased a USB Lightsnake guitar cord. It's better, but there's still an annoying level of noise which really gets bad when I switch to the metal effect... I've upped the noise gate which makes it okay, but I don't understand why I don't have this issue on any amps I've used. (cheapies, too)
I then took the USB Lightsnake, and ran it from my Line-6 amp's headphone out to the iMac... Much better, but still - switching to that metal effect creates a constant hiss, regardless if I have the volume totally killed on my guitar.
The only way I can get a clean distorted sound is to have garageband set to no effects, and use the effects on my amp. Are the effects in GarageBand that bad or something? I'm confused, and was hoping I could do recording without dealing w/ my external Amp...

In my experience, you can sometimes get interference from the computer itself coming in through the pickups. (Obviously single-coils will be affected more than humbuckers.) For a start, try moving away from the computer with the guitar (even a few feet may help) or angling the guitar away from the computer.
Secondly, I certainly notice more noise with the higher gain GB FX, like the full-on metal setting, etc. Some of that is just the nature of the beast -- higher gain means more noise, generally -- but backing away with the guitar may help. Adding some shielding to the pickup cavity in the guitar might help, too.
I've got a decent twin-humbucker guitar (and they're good, 3rd-party humbuckers), and I can certainly generate a lot of noise with high gain GB FX settings and the guitar close to the computer and screen. Twiddling around the settings and moving around with the guitar seem to help -- and then much of the remaining noise ends up lost in the mix, with any luck!

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Hi,
I would suggest you check for the following:
1st:
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* Hit Record. Play your Guitar (make sure it's levels&gain are turned up high enough....).
2nd: Using a simple cable to go into the mac is the most simple but not a good solution. In time you will want to get yourself a nice audio interface with a guitar level input (a so called "Hi-Z" input). The Audio Interface lets you adjust gain and maybe some other things before the signal goes into the Mac. It even converts it to digital data in a much better way the built-in A/D converter of your mac does.
However, you still should be able to record your guitar going straight into the audio-in-plug right now.
Fox

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Pictures:
[IMG]http://i253.photobucket.com/albums/hh74/mexicoxx93/Picture2-8.jpg[/IMG]
[IMG]http://i253.photobucket.com/albums/hh74/mexicoxx93/Picture5-1.png[/IMG]
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ASUSTeK Computer Inc. K50IJ
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iPod Updater Library 11.1f5
CD Driver 2.2.3.0
CD Driver DLL 2.1.3.1
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Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
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Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
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Bus 004 Device 002: ID 8087:8000 Intel Corp.
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Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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Bus 004 Device 002: ID 8087:8000 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 8087:07dc Intel Corp.
Bus 003 Device 002: ID 8087:8008 Intel Corp.
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Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
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I also wrote a script which alternatively removes and reloads the ehci-pci driver until my device is found in lsusb. It is sometimes helpful, but usually not. And even when my device is found that way, it can only be used for a while before disappearing again.
Anyway, such a hack is unacceptable... So, my questions are:
is it indeed related to overcurrent protection ?
is there anything else I can try ?
should I file somewhere an other of the numerous bug reports about "unable to enumerate USB device" already existing ?
If of any importance, I am running linux 3.15.7, because at the time I installed my system, I couldn't get the hybrid graphic card Intel/AMD working under 3.16.
Last edited by $nake (2014-10-18 16:29:06)

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Linux libra 3.9.4-1-ARCH #1 SMP PREEMPT Sat May 25 16:14:55 CEST 2013 x86_64 GNU/Linux
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Name : linux
Version : 3.9.4-1
Description : The linux kernel and modules
Architecture : x86_64
URL : http://www.kernel.org/
Licences : GPL2
Groups : base
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Required By : nvidia
Optional For : None
Conflicts With : kernel26
Replaces : kernel26
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Packager : Tobias Powalowski <[email protected]>
Build Date : Sat 25 May 2013 16:28:17 CEST
Install Date : Sun 02 Jun 2013 15:30:35 CEST
Install Reason : Explicitly installed
Install Script : Yes
Validated By : Signature

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These things are difficult to diagnose remotely, but here is something you can try....
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SELECT i_pledge_number FROM dual)
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Trouble with interference / guitar

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