Nevermind. We figured it out. I'm not at home so I had DH check the player for me. Yay! He set the player audio to D-PCM (I have a Sony) and the music is a lot louder now.
FYI: For Sony DVD players, I found these instructions.
Set-Up Menu
*** The set-up menu is accessed by pressing the Display button (on the remote) and navigating to the last icon/menu item. There are three options: Quick, Custom and Reset. The last one resets the player settings to factory defaults.
*** The Quick option sets the following options by asking a few questions:
On Screen Display Language (default: English)
TV Type (default: 16:9)
Audio output type (Default: line output L/R)
Dolby Digital conversion (Default: D-PCM)
DTS conversion (Default: D-PCM)
Speaker Setup (Front/Center/Rear/Subwoofer)
*** The Custom option allows you to set all options through a series of sub menus. All in all, the set-up options are quite extensive and the built-in multi-channel decoder supports features similar to that of most A/V processors, including bass management, time delay to compensate for speaker distance (in metres), channel level and balance, and test tone generation. About the only thing missing in terms of bass management is the ability to change the crossover frequency.
*** The player can also be configured to remember where you are up to on a particular disc (up to the last 40 discs), as well as auto-play and selection of audio track. Interesting audio options include a "CD Direct" mode (I am not sure what this means), selection of audio filter (between Sharp and Slow), and whether or not to permit output of 96 kHz/24 bit PCM audio tracks to digital out.