why would you plug it into the guitar port and not the mic port that just seems stupid if you ask me.
If you're using a radioshack mic with a TS (1/4") input jack, I recommend upgrading to something just a little more substantial.
Agile AL-3100 (highly recommended)
SX SST57 strat copy
OE30 Hollowbody
SX fretless bass
Epiphone PR-200 acoustic
Yamaha G-40 classical
Epiphone Valve Junior head
1x12 custom cab
4x12 Behringer Half-stack

My Solo Stuff

My Band