Perhaps it is the amplifier module, or the cable. To avoid this feedback noise, you can do it with a compressor module. Me I use 2 equalizer to modify my sound and It sounds great on every guitar. Also i have a CREATIVR XFI-fATAL1S pro soundcard with the front rack, what I do is I plug in the guitar into my computer and I can play with a like mixer with pedal effect directly, can add chorus reverb, adjust distortion and way more... It is cheap price for what the card can do. But the latest version is not better than the ancient one because in the old version you have 2x 1/4 input/output jack with volume control.
