MIXING LIVE SOUND ON A COMPUTER SOFTWARE

I would like to keep the cost as minimal as possible, prefer under $500. I would also like to be able to trigger samples or different sounds to mix in (for the drums) if possible, but not absolutely necessary. Are there any DAWs that work well for this? I currently use Tracktion for my recording and editing, but that doesn't appear as if it would be practical for live.

MIXING LIVE SOUND ON A COMPUTER SOFTWARE

I also need recommendations for mixing software that can be used for live performance, preferably that I can use plugins with. I have seen some that have built in effects and can operate without software running at the same time, are they reliable?. There are so many USB interfaces out there, I am getting confused. What are your recommendations for a USB interface that can do what I am looking for?. A plus but not absolutely necessary would to also have the ability to assign routing for each output. 0 or extremely low latency is the most important! Here are the abilities I would like to have for each individual input: 3 vocal mics (I can sub mix down to 1 if needed but prefer to not) I already have a decent laptop: Toshiba Satellite S55-A5169, 12gig, Dual Quad Core I7 running Windows 8. This is not for recording, just mixing sound for small and medium sized shows, indoors and outdoors. I am looking to start mixing our live shows from my laptop via a USB interface. Before I spend some money, I want to make sure I am spending it properly. I have been searching and reading for months on this and haven't found any answers that I am confident in. I hope I am posting this in the right area, if not please let me know.

Mixing live sound on a computer