This small hack restores the unused alternate invincibility tune, later heard in Sonic Advance 2 & 3. In the original game, Sonic 1's invincibility tune was used instead.
Patches for all regional versions of the game included in download.
Database match: Sonic Advance (USA) (En,Ja)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: D842AFA7DD1E84DE08ADDB94A51506F1BCAFD551
File/ROM CRC32: 63F70FD8