i have a line 6 spider iv 15w amp and i wanted to find out if a electro harmonix metal muff pedal will work well with it on the clean channel to give me a better sounding metal tone? (For playing songs by artists such as metallica and megadeth)
Have you tried that pedal with a tube amp to make sure you like the sound that the pedal creates? If so, then try it with the amp. The 'type' of tone you prefer is very subjective - what one person likes, may not be enjoyed by another.