Put all of the knobs at the neutral setting (no boost or cut), read the manual to figure out where to put everything, do not push any buttons in, set the gain correctly, and go from there. Try small adjustments and see if you start getting tones you like. Rather than boosting every knob, try decreasing the knobs to get what you want.
If everything still sounds bad - how old are your strings? Is your bass sounding good on other rigs? Dead strings can make ANY setup sound terrible. If your bass sounds great on other setups; you might not like the setup you currently have. Good luck.
Put all of the knobs at the neutral setting (no boost or cut), read the manual to figure out where to put everything, do not push any buttons in, set the gain correctly, and go from there. Try small adjustments and see if you start getting tones you like. Rather than boosting every knob, try decreasing the knobs to get what you want.
If everything still sounds bad - how old are your strings? Is your bass sounding good on other rigs? Dead strings can make ANY setup sound terrible. If your bass sounds great on other setups; you might not like the setup you currently have. Good luck.
^ That covers it extremely well.
I would only add that if you're looking for advice on settings and gear, please let us know what you're looking for. (Sound is too muddy? Sound is too clean? etc.)