Hi Sirs,

I'm driving a 2012 Toyota Vios 1.3E MT.
Last night as I was driving, I noticed a different engine sound every time I stepped on the accelerator pedal. It's a whining noise na medjo high-pitched na tumutunog after the rev. There's also this sound when I switch within the 1st, 2nd, and 3rd gear but mag lessen on higher gears although still a faint sound.

Once I got home, I popped the hood and noticed that there's also a burnt smell coming somewhere in the left side near the alternator. What may be the possible cause of this? Is it a sign of a failing alternator? or maybe a problem with one of the belt?
Any feedback will be much appreciated, thank you!