We all have those awesome songs that are very low and bad quality to listen. I was just experimenting with some of my songs that were like this and found a way to make things better and making it blast through my speakers. To do the following tutorials you must have the program called Anapod, anapod is a program that will allow you to convert your itune songs into .mp3 and save it on your desktop 
. Its also a great tool for backing up music. Anyways here is the tutorials of How I increased the volume of my songs.
- Right click on a song in itunes then click on Get Info.
- After a new window popped up click on Options.
- In Volume Adjustment take the bar and put it to +100%.
- Click Ok.
- Open Anapod Explore and connect your iPod to the computer
- Surf through Anapod Explorer until you find the song you just changed the volume to
- Once you find this song, Right Click and save the song to your harddrive
- Go back to iTunes and deleted the old song that you changed the volume to from your playlist or library
- Copy & Paste the new song that is on your harddrive
- Right Click on the new song and do the steps above from 1-4 for Volume Adjustment
It seems like a lot of work, but it works. So now for those amazing songs you have with low volume you can change the volume to hear it better :). This tutorial only works if the song is originally on your iPod. If its not on your iPod, put it in your ipod then start from step 1.
tnx
Well said.