Ableton Forum

I was trying to build a sound that had 3 oscillators tuned in a chord, with different envelope for each oscillator (like tuned echos).

there's no direct way to tune each operator in semitones (like 0, +4, +7) - or I didn't find it. Instead you have to use fine tune, which is expressed in thousands of an octave.

So, how do you convert fine tune setting into semitone ? There must be a formula (using log ...) but I was too lazy to look for it.

Instead, I experimented and build a conversion table.

The way I built the table is the following:
- use 2 operators in parallel, with basic sine preset
- play both operators continuously with same note (like C3)
- transpose operator A by -1 semitone (global transpose param)
- adjust operator A osc A fine setting until the 2 operators are in tune (use beating to fine tune)
- record the value
- repeat with 2, 3, ..., 11 semitones

Here is the table :

semitone / fine
0 ----> 0
1 ----> 60
2 ----> 123
3 ----> 189
4 ----> 260
5 ----> 335
6 ----> 414
7 ----> 498
8 ----> 587
9 ----> 682
10 ----> 782
11 ----> 888
12 ----> 1000

If someone has more precise values or the formula, I'd appreciate the update.

EricP

Eric... you need to get out more, dude...

Having almost forgotten how to do this, but with your experimental table to check my attempts against, I came up with the following perl program:
which gives

0
59
122
189
260
335
414
498
587
682
782
888
1000

cool I'll implement the formula in xls until Ableton adds the semitone display

thanks
EricP