The ksc75s aren't supposed to be audiophile headphones. They're supposed to be decent euphonic headphones that sound better than they should for the price. If you get them expecting revealing, you'll definitely be disappointed. I like my ksc75s for what they are: headphones to leave in my laptop bag for when I need headphones and can't be cutoff from the world.
bass v-amp pro is a bass multi-effects/amp simulator, kinda like the line 6 stuff. But yah, bass amps make great guitar amps. Bass amps are designed to put out a lot of clean power.