Just caught up on this thread. The advice here is good, but I wouldn't completely rule out the interface as the culprit regarding unwanted noise. While cable length can introduce affect noise, it sounds to me like the main issue could be the preamps on your UM2.
True, some parts you recorded too hot, which some people touched on. I.e. if you're looking at the waveforms as you're playing back the cover, and you hear it clip and get nasty, and at the same time you hear the noise (like when you're playing 2+ strings in the lead), you notice the waveforms are jumping a lot higher than usual, or you notice that on the software you're using to record the tracks, the meter shows a
red light (signifying clipping), then you're recording too hot and you should lower the gain. If you're recording a guitar track that's mostly quiet and only get's loud at one instance, I'd suggest recording the louder and more quiet parts separately so you can properly set the gain for each level.
But back to the preamps: one common mistake I would make when I started around 8 years ago was turn the gain on my old M-Audio fastrack up too high. Sometimes, this causes clipping (as mentioned above), but more importantly, since it was a budget interface with shitty preamps, even if my tracks didn't clip, if I turned the gain up, say, past 2 (on a scale of 1-10), you'd always hear some noise, which would get worse the higher you turned the gain. This would get even worse if you're using an amp sim, especially one that simulates a crunch or lead channel.
This is one of the dilemmas with getting a budget sound card. Most of us started with little to no budget. Unfortunately, the lower you go, the more likely it is that, at least some noise, will be introduced. If you have a buddy with a slightly better low-budget interface like a 2i2 or an Audiobox, try recording at the same levels and see if you still notice the noise. You might just have to save up and upgrade to a better interface (which you should be able to do for a hundred bucks or less).
Another thing you can try using is a noise gate, which is what I did when I used Amplitube as my amp sim. It sounds like most of the noise comes when your guitar tracks come in.
In case you don't know what a noise gate is, to put it metaphorically: let's say you're cooking and weighing out 100g of flour. You measure the flour in a small bowl. This small bowl adds a few grams to the scale, so you zero it out to make sure you're measuring the right amount of flour.
Well a noise gate can help zero out the noise that you hear when you aren't even playing your guitar. The idea is to keep your main signal as clean and unchanged as possible while removing the idle noise. Here's a pretty good video that quickly and simply covers it (on amplitube...fast forward to about a minute 15 seconds)
Not sure if the Le Pou amp sim comes with one, so maybe try another amp sim that comes with a noise gate and see if that helps.
Just wanted to say that, while the lack of crunch in the verse guitar really takes away the spine of "Where is my mind?", for someone just starting out, you've done a great job. I mean that. Just don't be discouraged if it's not right. That's what practice and experience is for!
Also, feel free to send me the stems if you want me to add vocals. Love singing that song
