#2
From 1:15 - 1:30 ish it sounds to me like the Eddie Hazel is using the wah as a filter, ie. set in one position, cutting the high frequencies and making the guitar sound kinda nasal.

At 2:00 you can clearly hear he's cocked it forward, making the tone much more trebly and cutting.

From 2:10 - 2:30 is really sublime use of the wah pedal. You can clearly hear it here as consecutive notes sound different.

At 2:47 you hear a classic wah effect of modulating a note after it's been struck.

You should be able to identify the rest of the wah pedal work on your own!

Fun fact: when my old roommate bought his first electric guitar, he played Maggot Brain without stopping for 5 days. I would go to sleep while he played Maggot Brain, and the first thing I would hear when I awoke would be Maggot Brain. I still love the tune!
#3
Yes.
Quote by AlanHB
Just remember that there are no boring scales, just boring players.

Gear

Bach Stradivarius 37G
Charvel So Cal
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Yamaha FG720S-12
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#4
Fun fact: when my old roommate bought his first electric guitar, he played Maggot Brain without stopping for 5 days. I would go to sleep while he played Maggot Brain, and the first thing I would hear when I awoke would be Maggot Brain. I still love the tune![/QUOTE

I remember the first time I heard that song after reading stuff about how it's the greatest guitar solo ever and all that other gushy stuff. So I sat in the dark listening to it. I did my best, but in the end I could only make it about halfway through before I decided that it just was not an interesting piece of music. And I have never since listened to it again and can't say that I regret that decision.
There's no such thing; there never was. Where I am going you cannot follow me now.