Julien Claassen <julien(a)c-lab.de> writes: With midi.el for Emacs, I'd currently do: C-x C-f filename.mid RET M-: (setq newdat (append (list smf-type smf-ppqn) (mapcar (lambda (track) (cons (car track) (remove-if (lambda (event) (eq (smf-event-type event) 'PC)) (cdr track)))) smf-chunks))) RET C-x C-f newmidi.mid M-: (smf-write newdat) RET C-x C-s A somewhat more convinient way to do operations like this going to be written soon, but if you know some bit of lisp, you can already do all sorts of operations on MIDI data. CM can most probably solve your problem too, but I dont know the syntax off-hand. http://delysid.org/emacs/midi.el -- CYa, Mario