I used Csound as a replacement to Acid type arranger at 1997. I wrote C code library for placing sounds and loops to the beat bars and to the tracks. My program then wrote the timed events to Csound score. The textual arrangement was not the problem, but every change to arrangement required a compilation of my C code. I would be interested in to know if Csound can be used as an audio engine in Acid type software. Then one would need only write a GUI. Or a textual UI as in trackers. Can the orc and sco data inside Csound be incrementally build and modified via liblo? A poor alternative would be that the entire score would be sent each time. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software