The 09xx and 0Fxx commands set the speed of the module. The difference between the commands is that 09xx modifies the first speed value and the 0Fxx modifies the second. This diagram shows which variables are affected by 09xx and 0Fxx 09xx/0Fxx example module (Game Boy) Retrieved from "http://deflemask.wikia.com/wiki/Effects/09xx_and_0Fxx?oldid=4142" Ad blocker interference detected! Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.