Basically all you have to do is click on one of the sonics to play a green hill with an affect on it.
click sonic for normal green hill, click sonic without a mask for reversed green hill, click on scratch sonic for fast green hill, click on chungus sonic for slow green hill & press on evil sonic for robotic/demonic green hill. arrow up turns the vol up, down arrow turns the vol down, left arrow slows the music down & right arrow to speed the music up. no secrets here, sorry, but since you found this message comment " i found the secret note" and if 50 people find it then i'll draw cyanide using only scratch.