I recently tried to do some reamping by using a passive DI box. I was told on another forum to run the -10 output of my soundcard to the xlr output of the DI box. Then, run the 1/4" input of the DI box to the guitar head input. I tried this and although I don't seem to get any noise when the guitar runs through the amp, as soon as I arm a track to record, it squeals uncontrollably. So, for example, I've got a Layla 20 and I'm running the output of the dry track out of output 3. Then, I have my mic set up to record on input 1. Input 1 feedsback like crazy. Am I doing something wrong? Will buying an actual reamp box take care of this?