I am a new bass player. I was a drummer for years but have picked up the bass about 6months ago. I just got a 300w GK head to two 4x10 cabs. Usually just run the one cab. My buddy who plays bass has been telling me since I got my bass to get a sansamp pedal. It's a tech21 pedal. http://www.tech21nyc.com/products/sansamp/bassdriverdi.html That's the pedal there. What does it do? What do I need it for? What is the DI?