Thanks to some positive feedback and suggestions, I added these features:
Pattern Settings Feature - Now you can set a starting and ending step, and also specify whether or not to loop through the pattern while you hold a key down, or just play the pattern once.
Random Generator Addition - Now you can toggle which effects the random generator can use.
Send These Parameters Function - Now you can select which parameters you want to send to the ES-1. If you want to manually tweak knobs on the ES-1, just use this function to deselect the right parameters.