Fourth release of CHIPNSFX tracker+player suite by CNGSoft : new command Control-D tells whether the current instrument is unused or the current pattern is a duplicate (Shift: erase unused instrument, turn current pattern into a link to the pattern it is a duplicate of). Minor bugfixes: inconsistencies in -P mode and in channel toggling, better compression when generating INCLUDE files, etc. Minor changes in several songs. New DESPERA1.CHP.