Stretching in a basic way

[turbopump]

Hello!

I confess that I am not familiar with the several modes of Flex (time, pitch, etc) however I am puzzled because I feel that what I would like to achieve is so simple (in words) that it seems strange to me that there is not a simple way to do it. 

what would I like to do: take an audio file and say “dear Logic, I want this file stretched / squeezed by a factor of N”, where N is a natural number or a fraction 1/N. 

of course I would like a simple “natural” effect: the pitch must not be preserved but change in the same way that — say — a tape slowed down or accelerated would. 

i know that I can hold Option and drag an audio file and stretch it. The effect is just what I would like, but really I don’t want to do it graphically. I would really like to be able to work with simple numbers. 

Is there a way? thanks

Marco

[polanoid]

One way would be to load the file into Quicksampler and use +/- 1  octave for N=2, 19 semitones for N=3, 2 octaves for N=4