Tried playing the sound several times in a row (read: mashed A, B and C), and it didn't sound much like the waterfalls. I tried different rhythms and everything.
I have updated the list with the aforementioned Waterfall sfx. Will also look into where exactly the SEGA sound is, as well as speed ups and fade outs. BTW any reason why these two are left out of the Sonic 1 Sound Test? If anyone knows?
The waterfall sound is the only one of a sequence of 'environmental' SFX; basically, it overrides music on its tracks, and can be overridden by SFX; when the SFX ends, it resumes, and when it ends, music resumes. It only keeps looping because waterfalls and water slides keep playing it over and over every half a second or so while they are leaded. In theory, these special SFX span $D0 to $DF, but only $D0 has any data. It is possible that it wasn't in the sound test due o an oversight, or they may have decided to stop before it, who knows. Regarding Sega sound and stuff: in Sonic 1: $E0: Fade-out $E1: Sega sound $E2: Speed-up $E3: Slow down $E4: Stop sfx and music In Sonic 2: $F8: Stop SFX $F9: Fade-out $FA: Sega sound $FB: Speed-up $FC: Slow down $FD: Stop music $FE: Pause $FF: Unpause
I've searched through, and found these sounds to not have been used ANYWHERE. It is very possible that they were those sounds at one point, and were replaced by the currently used ones. Unless anyone can find otherwise, I've marked them as unused. ICEKnight's mention of the sfx_Teleport was correct, and upon 2 seconds of looking, I found this for myself as well. I swear I am not simply guessing with these. It was an oversight. With that, the Sonic 1 SFX list SHOULD be complete.