korbbit wrote:a cable that runs from my guitar to the microphone jack
there's your problem.
a mic input is not a "hi Z" input that a guitar needs. google "Hi Z" if you don't know what that means. all you really need to know is that guitars need a "Hi Z" input.
the other problem is that unlike all the other cables in your setup the guitar lead does matter. its impedance, capacitance, all those techy terms. you really want a proper guitar lead, not just a cable with 1/4" on one end and 1/8" on the other end.
the other problem is that standard inputs/outputs on computers aren't really musician quality, they're there for the average consumer to play games and listen to youtubes.
get a proper sound card with a Hi Z input. don't go cheap on the sound card as it will have high latency.
google terms you're not familiar with, we could write a book on what these terms mean and all their implications.
in my experience I get my tone externally with a Line 6 PodXT. amp simulators inside a computer work and it's debatable which is better, Amplitube or a Pod, people love both. BUT when you want to play guitar and the computer acts up, or you get high latency or have to deal with a computer at all, I'd rather just not deal with the computer at all and play. I don't even need the computer to play guitar, I just play the Pod into my monitors.