Pitch & Tempo in AudioFile Processor

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Hi,

I'm using a single-note sample imported via AudioFile Processor to compose a melody. The problem is that when I change the pitch the tempo also changes. What am I not doing?
even a single note is 'too long' for that. Whatch my youTube tutorial on how to use micro-waves :p ..as instruments. I also have uploaded a folder with files that can be used as instruments. Free for everyone.
Link:
http://www.youtube.com/watch?v=DrTyzMo3VU4

BR