unwanted sound

[sireduc]

whenever i plug my 404 into my computers mic jack from the line out on the 404 i have this constant feedback sound

also whenever i plug my headphones into the sp its a lot more quiet and reasonable unlike whenever i am listening to playback through the computer

any tips or is this just the sp messing up

[timmytoga]

could be a ground loop issue. Try different configurations of plugging your gear into the wall and see if you can fix it..

[LO-]

also, if its grounding, try to unplug your computer and use your laptop battery when recordin g your 404.

or connect a ground wire from your 404 ground screw, to something else live, like the speakers or ?laptop if you kan.

[Om_Audio]

You def have a ground loop which are a major PIA but also laptops are worse because they introduce noises from hard drives and other components. If unplugging the laptop mostly solves it you have a ground loop.

I bought one of these recently- problem solved-
http://www.amazon.com/gp/product/B000LP ... UTF8&psc=1

Also these can help-
http://www.amazon.com/Ebtech-Hum-Voltag ... ords=hum+x

Good luck- and let us know how you get on.
C