This is a way to use a hex editor to create a new, fast version of a BRSTM. This also works with Multi-Channels.
You'll need:
A hex editor/viewer (I'll use HxD Hex Viewer/Editor, as it's free, and works well)
A calculator that can work with hexadecimal (You can use Web 2.0 Calculator, just set it to programmer)
A BRSTM you want to speed up
First, make a copy, as to not overwrite the original file.
Open it up in your Hex Editor.
Go to offset 0x64 or use the GOTO function (if it has it)
Copy down the 4 bits at the offset.
Go to your calculator, and convert it to Decimal. Mine is 44,100.
Add about 12,000 to the value. My value is 0xD2B4
Replace the value in your hex editor and save it.
Test it in BrawlBox.
This works by telling the BRSTM data to read it's self faster. This is why it moves faster. _________________________