go to profiles scroll down to advanced and then scroll to the profile you are using then hit the menu button then edit then scroll to whatever you want to edit then hit the track ball
Click your profiles icon and then scroll all the way down to "Advanced" and select it. Then scroll to the profile you want and push the blackberry icon button for your menu. Select edit. In here you can change all your profile settings including volume.
If the ringer volume is still too low after making the change, try an audio program to amplify the mp3 and then load it into your phone. I did that with my personal ringtones and it worked perfectly.