Programming your own extension. ------------------------------- All the necessary informations can be found in the _MUSIC.S file. All other extensions are here to show you how to create an extension. I suggest you copy the code from a small extension (like COMPACT) and remove all unwanted part, then type your code. This way you will not forget one crucial part. About the extension number: All official AMOS extension will go upward. You should choose a number from 26 downward. By doing this you'll be sure to be abble to use at the same time YOUR extension and OURS! About the names of your new instructions: The best way to avoid name conflict with AMOS instruction set and any other extensions instruction set, is to begin all instruction names by the same letters, specific to your extension. Example, all AMOS 3D extension instructions begin with TD. Have fun adding you own instructions. If you program something really special, remember to send it to Europres! Francois.