i did this type of game many years back and created an editor to sync the arrows with the tracks. If i can find it on my older harddrives i'll post the thing.
Basically you typed in the arrows on the notes you wanted and then based upon the speed setting the arrows would appear at the right time at the bottom and be in sync with your notes you.
Basically you typed in the arrows on the notes you wanted and then based upon the speed setting the arrows would appear at the right time at the bottom and be in sync with your notes you.