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You got two options really.
Either you get an audio interface with multiple inputs, so you can record several sources at the same time, which is more versatile.
Or you can get a basic mixer, which output you connect to the soundcard. The main problem with this method is, you'll have to make a premix of your sources on the mixer, and once that is recorded, there is no way of changing the individual levels.
So personally, I would go the audio interface route. A word of care though. You say you want to record guitar/bass. I don't know how you recorded it so far, but I'll say it anyway. Never plug a guitar/bass guitar directly into a regular line in. If you mike the amp, no problem, if you use a DI, no problem. But if you want to plug it in directly into the audio interface, make sure it has an instrument input. Otherwise it will sound crap (impedance not matched).
Now about the audio interface which 410 do you mean (Delta or Firewire), I dunno what gear you already have...
Either way, I wouldn't recommend them. The Delta 410 has no microphone preamps, so you can't plug in mics directly into it (you need either an extra mixer with preamps, or a separate mic preamp). The Firewire 410 would be good for you, except it only has 2 analog inputs working at the same time (it's one of the limitations of that device).
Like I said, I dunno what equipment you already have. Can you be a little more specific? About your way of working (how do you record the guitars, do you mike them up, do you use use DI (or effect box with integrated DI), plug em straight in? Do you have any way of preamplifying your microphone (mixer or separate preamp). With this info it would be easier to provide you with viable alternatives.
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