Hello. I have a problem I hope you guys can help me sort out. I bought a new amp today, a DIGITECH CS-2556 50w. AMP.

It has Overdrive (not quite sure what that is, I was told it is distortion) and it sounds really bad, as I am a metal player and like distortion. Now, I don't know if the reason it sounding bad is to do with my guitar as 2 of the 3 pickups don't seem to be functioning correctly. My guitar is a Samick, no idea what model. Guitar.

Can anyone shed some light on why the Overdrive sounds so bad? Is it the amp, guitar, pickups?

Thank you.
I'm going for it's the amp
ProTone Pedals: Attack Overdrive
Fractal Audio: AxeFX 2
Engl: Fireball 60
Zilla: Fatboy 2x12
Carvin: DC700
Carvin: Vader 7
Schecter: KM-7 MKii
Schecter: Banshee 8 Passive
Jackson: DK2M
amp for sure id say
Pedal GAS?
Empress Heavy
ISP Dec of some sort
Keeley Katana
TC Corona/Vortex/Dreamscape