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TURRICAN MD - SOUND ADJUSTMENTS

By Desko
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Introduction
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Readmes aren't typically my thing, but I thought I'd do a brief one. While working on a
disassembly of the game for a larger-scale overhaul I'm working on (MDRR), I found some
ways to improve the existing sound driver.

I've had this hack sitting on my hard drive for a while, but I thought I might as well
release this since I'll be replacing the driver for MDRR anyway (and likely releasing the
disassembly publicly), so here it is. This is only a minor improvement. It does NOT change
any of the game's patches, but it does make improvements that should make the game sound a
little better.


Changes
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- Enabled the sound driver's unused NTSC support.
- Fixed samples being played back incorrectly, causing the samples to sound corrupted
  during playback.
- Increased the global pitch of all songs so that most of them match their original Amiga
  counterparts.

Known Issues
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- Because the FM patches (instruments) were left intact, the instrumentation is still
  pretty bad, especially on consoles with YM3438s and emulators that don't emulate the
  YM2612's laddering distortion (that the instruments heavily abuse). Unfortunately, only
  so much can be done in this regard as the sound driver doesn't support changing patches
  mid-song, but I might address this in a future update.
- Tower of Morgul's pitch is still incorrect.
- While the NTSC support is stable, the way it's been applied could probably be improved.

How to Apply
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0. Download the patch, if you haven't already.
1. Extract the patch to somewhere on your hard drive.
2. Use a checksum tool to make sure you're using a clean .bin dump of the game or, for the
   best experience, a ROM patched with Linkuei's excellent Turrican Fixed patch.
3. Use your favorite IPS patcher (if you don't have one, I personally use Floating IPS)
   and apply the patch to your ROM.
4. Boot the ROM in your favorite Genesis emulator (lr-GPGX, BlastEm, Fusion, etc.) If
   all's well and good, the music should play at the correct speed with NTSC-U or J and
   you should hear the game's main theme playing in its original key. Enjoy!