Tutorial 1 - Note transposition

Topics

Note transposition using an arithmetical operator.

Functions used

Introduction to CHORD , om+.

Description

Notes in Om are expressed in midicents. Midicents are midi values (60 corresponding to middle C3) multiplied by 100 which represents cents (100 cents = 1 semitone).

The notes will be stored first in the chord editor.

Therefore, transposing a note up or down will be equivalent to add or retreive midicents value to a given note. For this we will use an arithmetic operator (generic function) om+ .

This patch transposes the notes in chord box (A) by adding (C) the value you have entered in the input (B) to every note.

Patch structure

A: Open the CHORD box (A) by clicking in the centre of the box. Choose the "order" mode to view the chord as a sequence of notes ready for editing.

The resulting view will be:

Please note that the order will be the order of the notes as they were edited, so it is not necessarly upwards arpegio

To edit notes inside the CHORD editor, "option-click" where you want the note to be written.Afterwards, close the CHORD box

and type "b" on the keyboard in order to lock the input you have entered.

If you don't lock the CHORD box, when you evalute the patch you will lose all the data input.

B: Enter the transposition value in the right input of the om+ box. To transpose by a semitone you have to enter the value 100. A quarter-tone corresponds to a value of 50 and a eighth of a tone to 25. These values are expressed in midicents. If you enter a positive number, the original sequence is transposed up, otherwise it is transposed down. To see the notation in quarter- or eighth- tone notation you have to choose as shown in the next figure.

C: The addition box, om+, transposes the notes by adding the transposition value to every note in CHORD box.

D: Evaluate the chord box and see the result by opening the box.