Often a bit of Saturator is just the thing to push an aggressive bass sound just over the top. The problem is that while the Saturator can add midrange and high end grit to a sound it sometimes ends up reducing the bass frequencies – not such a good thing for bass.
The trick to avoiding this is to turn on the Color switch and turn down the Base knob a bit:
Try out Saturator on a bass sound and set it up roughly like you see it above. As you turn down Base, more of the low frequencies are allowed to pass through unaffected, keeping your subby goodness in tact. Turning off Color disables Base completely and makes it really easy to hear the difference.