I need some help, I just bought a Crate bfx-100 and I cant get that slap bass sound out of it. Is it just the amp or am I not doing something right?? Another thing is that I can barely hear the effects and when i play above half of its volume knob capacity, the limit light flashes and I get a distortiony sound. If you can help with any of these things, it would be very helpful. thanks.