Thanks/bedankt Bas for the educative reply. I think I got misleaded by Max/MSP's tutorial[1], because MSP seems to automatically adjust the phase when you combine two oscillators in the way that I did.
Joost [1] page 112 of http://www.cycling74.com/download/MSP45TutorialsAndTopics.pdf -- http://mail.python.org/mailman/listinfo/python-list
