Sound is very moody and unclear.
When I choose a Bass Amp from the list, even with all high frequency knobs (mid, hi, and presence) turned up in their highest position, it still sounds like underwater.
I connect my guitar straightly to a "line in" input on my motherboard (I use standard motherboard audio, no additional sound card module), without DI boxes or whatever stuff.
Here's the plot of the spectrum:
When I hit only one (lowest) 'E' string (with all amps eqs and compressors turned off, just clean signal as it goes from 'line in'):
Should I get a DI box or some additional equipment?
Added: sound sample Sound sample