Welcome to the only RTTTL player on Scratch (so far). Bugs: The duck and the square wave lag a bit compared to the music blocks. You MUST format your RTTTL before playing it. First, get rid of the name and the colon at the beginning and add a comma at the end (use the up/down arrows to go to the beginning/end of the answer box). If it says d= a one digit number, put a 0 in front of it like this: d=04. Do the same thing to b=; b=45 > b=045 Explanation of an RTTTL: It stands for Ring Tone Text Transfer Language. It was a way for early Nokia cellphones to transmit and store ringtones. You may an old digital cellphone that would use this format. Most of the songs have been edited to work with this program and may not have the same length, composition (or tempo XD) as the real thing.