Very nice! I must admit, I was already positively prejudiced when I read the title and instrumentation. Recorders are sadly much too neglected as instruments, but I love their very straightforward, direct sound. Using them for a piece featuring "lines" makes a lot of sense. (Or making "lines" the subject of a recorder piece for that matter.)
The different degrees of randomness worked quite well in my opinion. The first and third part were clearly different from the middle part, yet they were well jointed and seemed to follow each other naturally. When I saw the score I was at first sceptical whether the combination of notation and randomness in the third part would work, or whether the randomness of the second recorder would blur the notes of the first recorder so much that no order would be recognizable. The predominance of certain main notes made it work out very well though (h/b and f mainly, but also c and d. I didn't really hear the c at the end of this phrase in the first recorder. Maybe that's because it became a multiphonic too fast, or I just didn't hear it.)
That way there's a nice mixture of harmonical randomness and audibly ordered intervallic relationships and dominant notes, and between spontaneity and structure. Congratulations!
What program did you use to write this by the way?
P.s. I love the multiphonics
