* BUGFIX: "pulse off" was disabled when compiled with setp command 
* BUGFIX: couldn't jump to spl in pulse/filter tables
* BUGFIX: stupid bugs in pulse add/compare function - should work in _all_ cases now!
* minor optimizations - a few sec's, clc's, and cmp's here and there
* optimization: don't set high byte of pulse add to zero when it's never used