TMNT-TOURNAMENT FIGHTERS-COWABUNGA EDITION v1.0 w/MSU1 Audio Compatibility (SNES merged patch)
Instructions:
Download single patch from https://archive.org/details/nintenja-various-merged-rom-hacking-patches and patch to headerless TMNT-Tournament Fighters (USA) rom with erc32 of e2fe5dbf.
You can patch roms at https://www.marcrobledo.com/RomPatcher.js/
In options choose correct checksum before patching.
Download MSU1 files from:
https://www.zeldix.net/t1985-teenage-mutant-ninja-turtles-tournament-fighters
Rename patched rom to same as MSU1 files and put in folder.
Play patched rom with SNES9X

Credits: gallaux for cowabunga edition v1.0 hack https://www.romhacking.net/hacks/7374/ , kurrono for MSU1 patch, and PCM set by Senor Ventura, and Nintenja for merging hacks.

Cowabunga Edition v1.0 is:
4 enhancements were available by default in the version of the game in Teenage Mutant Ninja Turtles: The Cowabunga Collection, while the original SNES version required cheat codes. This patch enables those cheats by default:
Unlocks 2 secret characters in Versus mode: Rat King and Karai
Unlocks 2 additional stages in Versus mode
Grants access to the hi-speed 3 feature in the Options menu
Allows up to 10 credits for Story Mode in the Options menu