I really like this app and might check it out, but I don't know if it supports the same charting format.
The chart system used in Beat Storm is based on the exact amoumt of time since December 31 1999.
Charts are stored as a simple list where odd numbers are the data of the note (position/rotation), and even numbers are the times they are supposed to spawned, are stored in a single line, each object separated with with a forward slash.