Increase the Volume

I was hoping someone could help me.  I work in a very loud environment, and have trouble hearing my phone.

I had a Samsung Impression for a short time.  They provided information on how to increase the volume.  They even had a file you could load on the phone.  It worked quite well.

Here is the link:  http://www.samsung-impression.org/samsung-impression-how-to/volume-increase/?PHPSESSID=3d184af4b6579550dff6749e3e0bfd2e

Is there anyone out there who can do something similar on the Expo?  I adore my phone, but it really needs to be louder.

Thanks in advance.