I want to adjust the volume of a ringtone in my iTunes?

I just created a ringtone using an iPhone application. I made it an m4r file all that, but the volume is low when it plays, even when the volume is at maximum on my phone. This is especially noticeable if you listen to my other ringtones.

I figured I could adjust the volume by right clicking the file, click 'get info' and adjust the volume from there. However the volume bar to control the function is totally grayed out. Is there any solution? Help would really be appreciated, it's a pretty bad *** ringtone apart from it not being loud enough.

Added (1). This is what it looks like. The volume adjustment bar is there, i'm just not allowed to use it?

I don't think you can if that was the orginal volume of the song.