Redigit has confirmed that the tracks and sounds in SMBX were recorded with Audacity from the SNES emulator called ZSNES. ZSNES screws up all the sounds with fast intonations. Because of this, the sounds that SMBX plays when Mario grows or shrinks, fires, jumps out of Kuribo's shoe, an NPC fires, Blargg yells etc. sound bad. Well, I re-recorded all the screwed up sounds and bad quality songs with another SNES emulator, SNES9x, which has a much better sound quality, and it ended up so good that I'm now permanently using these. It sounds much more like the original Super NES.
ZSNES is also the reason why people think SMB1 SNES, SMB2 SNES, SMB3 SNES and SMW have different sound effects. ZSNES leaves out random notes when playing the sound effects in these games (and in all the other SNES games, too) making them sound different. The truth is that all these four games use the exact same sound files. ZSNES is an okay emulator, but it has a shit sound quality. Not everyone cares about this, though.
If you don't believe me, have a few sounds from the original SMBX sound set and the original SNES sounds as what they're supposed to sound like.
Item coming out of block
SMBX - My pack
Player power-up
SMBX - My pack
Player shrink / warp pipe (they use different sounds in SMBX for some reason)
SMBX - My pack
Spin jump / Racoon tail
SMBX - My pack
Door
SMBX - My pack
Dragon Coin
SMBX - My pack
Birdo Beat
SMBX - My pack
Level select
SMBX - My pack
How to use these
- 1. Back-up the original SMBX sounds. Copy the original SMBX sound folder and paste it somewhere else.
2. Extract the ZIP file containing my new sound folder to where the original sound folder was.