I want to be able to get sounds like steel drums, horns, etc. from my bass. I have been looking at the Yamaha G50 and was told that I can achieve these sounds with the unit and a B1D pickup. First, is this true? Or do I need some external unit other than these to get the sounds? Also, I believe I read you can interchange midi pickups? Is this true. I know the MIDI is based on the 13 pin cable. I am very very new to this and want to make sure I have my facts straight before I spend the cash. Any help would be great.