This may seem obvious, and it may also be sacrilege to some, but I thought I would share an easy method that has significantly increased my enjoyment of Turbo-CD games.
A lot of CD games, including some of the really good ones, have sound effects that are just too damn loud. Others don't have it quite so bad, but for me personally, it's better when the music always has a certain "auditory-priority" over the sound effects. Since it's a CD, why not change the audio and make this happen?
Enter
MP3gain. This small, stable, friendly and free program is extremely efficient at adjusting the recorded volume of an entire CD or album. The catch, unfortunately, is that it only works on mp3s, but I find the benefits to be worthwhile enough that I'll convert anything to mp3 just to use it.
Basically, use the "Album analysis" function to check the tracks of a game for its average volume. Enter a new volume that is 3 to 7.5 decibels higher, click "album gain", and there you go. Just don't go much over 95, or you'll risk getting a lot of noticeable clipping distortion.
Use something like
winlame for WAV<->MP3 conversion, good ol'
TocFixer to properly size your tracks, and your preferred burning program to make yourself a custom-balanced CD. Just remember, if the game uses the internal music at any point, it will sound very quiet compared to the CD tracks. Same goes for AD-PCM voices.
Here are some games I think benefit a lot from this:
Gate of Thunder
Lords of Thunder
Sapphire
Cotton
Sylphia
Terraforming
Metamor Jupiter
Hellfire S
Nexzr
Alzadick
Spriggan 1 & 2
...and many others.
Anyone else ever try this before? Let me tell you, it's awfully nice to be able to hear the music in Gate of Thunder no matter what weapon you're using. Not to mention, overriding the the downright grating sound effects in Sapphire actually makes it a better game IMO.