If you only have one keyboard, you could get an Echo Layla. The older 20 bit version you can find on Ebay for pretty cheap, and it has MIDI in/out, 8 analog ins, and 10 analog outs. Basically, it is a PCI card you install into your computer and has an expansion box with the ins/outs. If you installed a pro sound card, you would have to go into the system BIOS and disable the onboard sound. This would probably work well for you and you could pick it up for about $150 - $200. Good luck homie.