Actually Bass sweeping sounds awesome. Look at Billy Sheehan. A bass is meant to keep rythm down, but durng small break or bridges, you can add whatever you want. Sweeping arps will sound killer on bass. If you want to effect on guitar, roll your tone knob down on your guitar, clean settings, and sweep on the e, A, and D string around the 12th fret. Sounds out of this world.