I have tried the GuitarFx which is excellent, and with that
installed I want to expand on the possibilities, I would like to
play some mp3 files at the same time while playing my guitar and
following with the music, now is there any way that we could go
around this , I have notice that with the guitarfx and as it is open
I can't play music anymore, becaus of a driver that is already being
used or something, would the solution be to plug in a second sound
card or any sugjestions would be appreciated.
Thank You

--- mumufuk comments ----
GuitarFX 3.04 has all you need. Take your mp3 file, load it into
freeware mp3 player "WinAmp" from winamp.com, select in winamp
output as wav file (read winamp help for how-to), then playback
your mp3 using winamp. You will have wav file extracted from your mp3.
Then run GuitarFX 3.04, select in top fx-slot the "Playback",
press tune button near top fx-slot, load your wav file,
constract your effects chain, press "Start"
button on the face of the GuitarFX 3.04, enjoy!