Very Interesting. I like it. It appears that you have rendered those midi track from Guitar Pro into audio and played around with Nuendo. Nuendo is mostly for audio at pro level. Have you tried FL Studio, Ableton Live, Propellerhead Reason, Acid, Project 5 or Storm instead? Those might be more friendly with your setup, you might like them better, but it's your choice. I prefer Reason the most.I've used Guitar Pro to read tabs a few times. But it's very interesting what you've done with it. It sounds dark and ambient, which is cool. I can hear the clicks and pops, you definetly need a better soundcard.

Keep up the good job bro and hope to hear more in the future.