Buuut, the "voice samples" provided during character generation are often suboptimal. In any case, many people have made calls for cosmetic post-creation change options in various ways (hair, tatoos...Skyrim Voice Commands. bearzerk Rank: #5587. skyrim.
I found a nice simple fix to the sound. If you go to the sound thing from the control panel and click on properties, then enhancements, and finally select "loudness equalization" it makes it louder.