Recording Bass problems

What does the wave form look like? Is it filling the track or is it almost a flat line?

If it's a flat line you need to raise the input level.

However.... you did say it's almost in the red.

You could double click the track and select the normalize function..... that will raise the level in the track digitally.

From the top tool bar: Process>Audio>Normalize

If the tracks are at or in the red, the levels are being recorded.
However, the frequencies where the energy is at may be the problem. 
As Greg suggested, the mic, or recording setup may not be ideal.
It's possible the mic is picking up near subsonic sound, that while it may show a high level in the meter, is nearly inaudible.
It's also possible that the mic is fine, but your playback device, ie, speakers, is not accurately representing the sound.
MC3 itself, is mostly a handler. If the sound is there, it will pass it through.
Do you have VoxengoSPAN? If so, where is the bulk of the waveform?
Is it in the 20-50Hz range?
Hold CTRL, and sweep the frequencies, high to low.
Does what you hear seem to match what you see?

MC doesn't have any problems recording bass - whoever said that was misinformed.

it's possible your sigmatel, however, could be causing you problems.  they're not the best for recording anything.

the xenyx 802 as a DI should be fine as long as you don't have a really low output on the bass. 

are your recording levels and playback levels the same in MC?  what I mean is that are you recording "some in the red" on the bass track, but during playback the meters never go into the red?

Yep that is exactly the problem Beagle. Some in the red while recording, but during playback meter never gets to the red! What could that be?

Thanks guys I'll give it a try. The imput and output levels were different, but I haven't tested the result since I changed them yet. If that doesn't work may have to get an external sound card.