Hi, Im stuck with something simple, i cant figure out :) This works fine =>// test score // sound chain; SinOsc s => dac; // create class with a function to return midi values //given and input string class mymidivals { int result; fun int midivals (string x){ if (x == "c4") 60 => result; if (x == "d4") 62 => result; if (x == "e4") 64 => result; if (x == "f4") 65 => result; if (x == "g4") 67 => result; if (x == "a4") 69 => result; if (x == "b4") 71 => result; if (x == "c5") 72 => result; return result; } // fun }// class //define object mymidivals midivals;// create array with the melody notes ["c4","d4","e4","f4","g4","a4","b4","c5" ] @=> string song[]; song.cap() => int songcap; for (0 => int i; i < songcap ; i++) { 0.2 =>s.gain; Std.mtof(midivals.midivals(song[i])) => s.freq; 0.5::second => now; ===================================But if i put the function mymidivals on a .ck file like this //midivaltest.ck // create class with a function to return midi values //given and input string public class mymidivals { int result; fun int midivals (string x){ if (x == "c4") 60 => result; if (x == "d4") 62 => result; if (x == "e4") 64 => result; if (x == "f4") 65 => result; if (x == "g4") 67 => result; if (x == "a4") 69 => result; if (x == "b4") 71 => result; if (x == "c5") 72 => result; return result; } // fun }// class mymidivals midivals;=============================================and if call it this way, it does not work, error => undefined variable "midivals" // test score// sound chain; SinOsc s => dac;;// midivaltest.ck lives on same dir as this code Machine.add(me.dir() + "midivaltest.ck"); // create array with the melody notes ["c4","d4","e4","f4","g4","a4","b4","c5" ] @=> string song[]; song.cap() => int songcap; for (0 => int i; i < songcap ; i++) { 0.2 =>s.gain; Std.mtof(midivals.midivals(song[i])) => s.freq; 0.5::second => now; } -------------------------------------------------------any ideas ? Thanks