hello thorsten thank you for your time and your quick reply :D I'm starting the bat file from the dos terminal (run cmd.exe) then I navigate to the folder wich contains the app directory, for the analog toolbox: E:\data\midibox\analog_toolbox_v1_1c then I type make and press enter... below is the content of the analog toolbox directory: E:\data\midibox\analog_toolbox_v1_1c>dir De volumenaam van station E is LOCAL Map van E:\data\midibox\analog_toolbox_v1_1c 18/12/2005 15:51 <DIR> . 18/12/2005 15:51 <DIR> .. 10/11/2005 23:34 6.202 aout.c 10/11/2005 23:34 3.479 aout.h 10/11/2005 23:34 305 CHANGELOG.txt 10/11/2005 23:34 207 clean.bat 10/11/2005 23:34 13.413 cmios.h 10/11/2005 23:34 18.671 COPYRIGHT.txt 10/11/2005 23:34 3.978 eg.c 10/11/2005 23:34 2.583 eg.h 10/11/2005 23:34 7.216 eg_table.inc 10/11/2005 23:34 2.951 lfo.c 10/11/2005 23:34 2.139 lfo.h 10/11/2005 23:34 7.473 lfo_table.inc 10/11/2005 23:34 7.751 main.c 10/11/2005 23:34 2.350 main.h 10/11/2005 23:34 66 make.bat 18/12/2005 16:29 1.128 Makefile 18/12/2005 16:29 4.345 Makefile.bat 10/11/2005 23:34 1.469 MAKEFILE.SPEC 10/11/2005 23:34 6.262 map.c 10/11/2005 23:34 3.019 map.h 10/11/2005 23:34 3.384 midi.c 10/11/2005 23:34 2.343 midi.h 18/12/2005 15:51 <DIR> mios_wrapper 10/11/2005 23:34 5.377 pic18f452.c 10/11/2005 23:34 21.979 pic18f452.h 10/11/2005 23:34 17.302 project.hex 10/11/2005 23:34 1.118 project.lkr 10/11/2005 23:34 7.104 project.syx 10/11/2005 23:34 8.610 readme.txt 18/12/2005 15:51 <DIR> tools 18/12/2005 15:51 <DIR> utils 18/12/2005 15:51 <DIR> _output 28 bestand(en) 162.224 bytes 6 map(pen) 18.034.728.960 bytes beschikbaar thank you very much, Michael