How much tempo change from changing pitch

Ive always enjoyed changing speeds of my favorite songs, even before DJin and all that. MY question is this
On the MPC
Lets say if I have a sample that originally had a tempo of 75
If i change the tempo +2 ....whats the new tempo?
For every octave raised or lowered roughly whats the change in tempo

This has been boggling my mind for some time now. thanx

I could be wrong, but I think it's:



Where x is the amount of change you made in the mpc.

Since there are 120 tuning steps in an mpc to reach one octave, and one octave is the base tempo * 2.

So 75 tuned up +2:
75 * 2 ^ (2/120) = 75.87

or did you mean +20 (which would be 2 semitones):
75 * 2 ^ (20/120) = 84.18

I tried this once before and totally screwed it up, so that might be wrong, but it looks right to me.

Edit: one other caveat is this is for a 2kxl, do the new ones work the same way?

http://mp3.deepsound.net/eng/samples_calculs.php

That's the right formula by the way. My 1k has 10x the tuning resolution, so for mine it would be

new tempo = old tempo * 2 ^ (x/1200)

and the example given would be x=200, but the result works out the same.

I think what he wants to know is, what happens if you change the pitch on your turntable by +2.
I dont know it but you could try it out.

1. sample a loop at normal pitch into your MPC
2. change sample-pitch in MPC by 2 semitones (+20)
3. play loop in MPC and try to find correct speed on turntable

easy

I think he was clear in stating what he wants to know.