Posted on Aug 18, 2005 11:47 am
Member Since: Jun 27, 2004
Hey all! Got a bit of a problem here and I'm hoping someone can help, cos I'm about to go insane! Okay, below is a link to a very crude diagram of my system!
As you can see, the POD XT Pro is connected to my M-Audio FW410 in two ways; by SPDIF, and by a single unbalanced 1/4". The purpose of this is so that I can record the dry, and effected guitar simultaneously, then feed the dry guitar back into the POD over SPDIF to change the amp tone at a later date! Sounds great.
Only, when I do this...I get noise. And it corresponds with whatever is going on on my laptop. If I move the mouse, or open a window, I can hear it. If I just run the XT Pro straight into my soundcard, there's no problem, but its as soon as I try and go back into it that the problem occurrs.
Thing is...when I unplug my laptop...the problem dissapears. I've also tried removing my amp from the equation, makes no difference. Only unplugging the laptop from the mains helps. Also, if I move the plug tree ever so slightly, the noise *almost* dissapears, but it comes back eventually.
Any help would be greatly appreciated! I'm *almost* convinced that I need to lift the ground on the laptop power supply, but I read somewhere else that sometimes, these things seem like ground loop problems, but are actually the result of "switching" power supplies, in which case, lifting the ground would solve nothing! And I'm also very confused as to what kind of connection allows a ground loop to form.
Thanks very much in advance,
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