So I often hack smw. I recently recreated physics in smw to similar to its nes siblings. Check out my super Mario arcade hack you will see what I mean.
My step is make better sound effects because frankly smw's suck.
I found some samples I think will work and I found music sheets with the notes... But I don't know how to read them. I wonder if someone who does know how will type them out so they are more legible to me. I will give credit for the work done.http://markdesimonedotcom.files.wordpress.com/2011/09/mario-sfx.pdf
There is the link to the sheet.