(Original guide by Kram1024)
Okay, you have my dated sonic 3 sound driver working, but you will probably notice that it is rather limited in what it can do in its current form, and recently Flamewing modified a s&k sound driver, which is a slightly improved version of the sonic 3 sound driver and someone has ported it to sonic 2 with a very similar process to what I did in part 1. Wonder why this is here? Well, I felt it would be easier to continue where we left off and convert the old driver here to the new one.

More about the Flamewing S3K Z80 Sound Driver

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SCHG How-To Guide: Sonic the Hedgehog (16-bit)
Fixing Bugs
Fix Demo Playback \| Fix a Race Condition with Pattern Load Cues \| Fix the SEGA Sound \| Display the Press Start Button Text \| Fix the Level Select Menu \| Fix the Hidden Points Bug \| Fix Accidental Deletion of Scattered Rings \| Fix Ring Timers \| Fix the Walk-Jump Bug \| Correct Drowning Bugs \| Fix the Death Boundary Bug \| Fix the Camera Follow Bug \| Fix Song Restoration Bugs \| Fix the HUD Blinking \| Fix the Level Select Graphics Bug \| Fix a remember sprite related bug
Changing Design Choices
Change Spike Behavior \| Collide with Water After Being Hurt \| Fix Special Stage Jumping Physics \| Improve the Fade In\Fade Out Progression Routines \| Fix Scattered Rings' Underwater Physics \| Remove the Speed Cap \| Port the REV01 Background Effects \| Port Sonic 2's Level Art Loader \| Retain Rings Between Acts \| Add Sonic 2 (Simon Wai Prototype) Level Select \| Improve ObjectMove Subroutines \| Add Sonic 2 Level Select \| Collide with Water After Being Hurt \| Smooth Out Rotation in Special Stages
Adding Features
Add Spin Dash ( Part 1 (GitHub)/(Hivebrain) / Part 2 / Part 3 / Part 4 ) \| Add Eggman Monitor \| Add Super Sonic \| Add Extended Camera \| Add the Air Roll \| Add 6-Button Support
Sound Features
Expand the Sound Index \| Play Different Songs Per Act \| Port Sonic 2 Final Sound Driver \| Port Sonic 3's Sound Driver \| Change The SEGA Sound \| Correct PAL Music Tempo
Extending the Game
Load Chunks From ROM \| Add Extra Characters \| Make an Alternative Title Screen \| Use Dynamic Tilesets \| Make GHZ Load Alternate Art \| Make Ending Load Alternate Art \| Add a New Zone \| Set Up the Goggle Monitor \| Add New Moves \| Add a Dynamic Collision System \| Dynamic Special Stage Walls System \| Extend Sprite Mappings and Art Limit \| Enigma Credits \| Use Dynamic Palettes
Miscellaneous
Convert the Hivebrain 2005 Disassembly to ASM68K
Split Disassembly Guides
Set Up a Split Disassembly \| Basic Level Editing \| Basic Art Editing \| Basic ASM Editing (Spin Dash)

|Port Sonic 3's Sound Driver to Sonic 1: Part 2]]

SCHG How-to

Port Sonic 3's Sound Driver to Sonic 1: Part 2

From Sonic Retro

More about the Flamewing S3K Z80 Sound Driver