Using the Interface Boxes : Example
Building a Triad with an Item-List-Box, a Button-Box, and a Check Box
A minor or major triad is created with three interface boxes : multiple- items-list-box, button-box, and check-box.
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On the left the
build note!button calls a series of boxes :-
two list-boxes allow to choose a note name from A to G, and an octave index, from 1 to 5.
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the resulting reference is returned as a list with three lisp functions to n->mc[1] ,
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n->mc returns a midicents value to a chord box.
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On the right, the
build chord!button calls another series of boxes :-
The
minorcheck box is checked and returns “true” to OMIF, -
OMIF returns 300, which makes a minor third. If it isn’t checked, OMIF returns the value of a major third - 400 mc.
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The value of the root is added with 300 and 700 to build a minor triad, via two om+ boxes.
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The resulting values are gathered by x-append into one single list and returned to a chord box.
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Note
As n->mc returns a list , we have to use a chord box, and not a note box, to create the root of the chord. A note box doesn’t accept lists, but atoms.
Choosing and Listening to a Sound with a Pop-Up-Menu Box
Arguments of the Pop-Up-Menu
This pop-up box returns two types of results :
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Input #1 is connected to a textfile box, which contains a list of midi channel names . When output #1 is evaluated, it returns the midichannel number.
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Input #2 is connected to a lambda patch, which can play the sound of a selected sample.
About MIDI Functions in OM
Inside the Lambda Patch
A sequence function evaluates two elements successively :
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The pgm-out function sets the MIDI program from the midichannel index value passed as argument to the lambda patch.
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The play function plays a note with the chosen midi sound.
The action programmed in the patch is executed when an item is selected in the pop-up-menu box.
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References :
- n->mc
Converts a note name or list of note names into corresponding midi cents values. The reference is the standard notation, where the medium C (6000 midicents) = C3.
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