Okay Bobby,
Try this Behringer instead. It's 8 channels max (really six, with two channels of Aux return). This is all you need, going with the other one is a lot of money that you won't be using. If you attempt to use the mixer you're looking at, it will have NOTHING to do with the Audigy card in your system. Everything is via the USB connection, which means you'll have all sorts of weird routing issues, using the Behringer USB as your input, using the Creative S/PDIF as your output, unless you want to monitor the sounds as you record vocals or other instruments. Noooooooooooo, stay away from that.

Plug the outputs of the Ketron SD2 into the 3/4 Stereo inputs. Since the SD2 is a stereo device, you want to use the Stereo channel strip. Plug the mic, either the old Peavy, or whatever you're going to get new, into the Channel 1 input. Depending on whether it's a 1/4" jack, or an XLR jack, will depend on which input you use. While I recommended either a condenser or a dynamic mic, this little mixer will handle both. However, if you use a Dynamic mic, make sure the 'Phantom Power' button is off, since it applies voltage (48VDC) to the jack, and you don't really want to do that to a Dynamic mic.

Next, take the TAPE OUT jacks, the RCA ones, and run them to the RCA jacks inputs, of your Audigy Card. Since you're using something an Audigy Platinum , you'll have several inputs, and you'll need to select the one you're using in the Creative Mixer panel.

Now, in RB, ANY MIDI track you have must be recorded into RB. You want to record EACH MIDI track separately, so that you have an individual audio track for each MIDI part. This will allow you greater options when you go to mix down. Also, if you're recording a guitar part or such, each of those tracks get recorded to a separate track. All the while, make sure that the mic input level is all the way down.

Now, turn the mic input up to where it needs to be (you'll need to play around with it to see where that is) and turn the SD2 input all the way down. Depending on how you have your speakers set up, you may also want to run the Speaker Out from the Audigy card to the Tape IN of the mixer, and you can select to listen to the Tape IN instead of the powered speakers you have, and then send it to a nice set of headphones. Now you can do your vocals, and not hear all of the stuff you've already recorded in the background. If you are using the 5500 speakers, and have them connected to the optical or coaxial output of your Audigy card, you can mute them and still listen to the headphones as you record your vocals.

I think that this setup, which is far less than just the other mixer, and gives you a relatively nice set of headphones (they're the same ones I use, so I'm biased) will bring you great satisfaction. If you're also playing guitar, you might consider spending this for two mics, which are condensors. One for the vocals, and one for picking up the guitar. I forget if you play guitar. However, the mixer will support both with two mic inputs. Since these are condensers, you will need the Phantom Power switched on for this.

Anyway, I hope this gives you an idea of what can be had, and not for a whole lot of money, really.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!