Hello dear PD patchrepo community !

I'm currently trying to make a PD patch that will basically produce different chords when I use different keys on my midi keyboard. I stumbled upon one patch which seems to be a good basis for my work so far but it's too limited ; I'm not very technical savy ( more of a musician actually ) but for my course ( bachelor in sound engineering ) I'm supposed to make a patch that generates chord when I play a note on my MIDI keyboard.

I'd like to generate different chords ( for example minor chords, major chords, and scales for example ) which would be triggered when I use keys on my midi keyboards; do you think this is feasible ?

So far this is what I got;

7th chord generator.pd

Just to make it clear for example I'd like my patch to generate a C major seventh cord by inputing the C key on my midi keyboard and add more versatility to my patch by adding extra functionalities such as being able to make a reversed chord too...

I'm struggling to build this patch and any help would be greatly appreciated !

Thanks a lot !

@chopin83 You could have a look at this thread.
https://forum.pdpatchrepo.info/topic/9416/how-to-chords
The input was from the computer keyboard, but it could be from a midi keyboard using [notein]
The output was oscillators, but could be sent to [noteout] for a synth.
David.

@chopin83 This will just take basic math if you are not concerned about key and be much simpler if you are calculating it from the root instead of from the 7th like the patch you found does. Our major scale is W-W-H-W-W-W-H, to put this in the view of midi note numbers, 2-2-1-2-2-2-1, so we just need to add the appropriate numbers to generate the chords and output the midi. For a Maj7 we just take the midi note and add 4 to get the third, and 3 to that to get 5th and add 4 more to that to get the 7th, for middle C (midi note 60);
60+4 = 64
64+3 = 67
67+4 = 71
Which means our Cmaj7 is midi notes 60-64-67-71 and Dmaj7 would be, 62+4=66, 66+3=69, 69+4=73 or 62-66-69-73 and we can easily change this chord to minor by adding 3 instead of 4 when we calculate the third and this also shows a fault in the math, we can no longer just use the result of the previous calculation in the next because that would give 60+3=63 and 63+3=66 and so on, it flats everything. So we go to calculating all the notes from the root, to get the third we add 4, to get the 5th we 7 and to get the 7th we add 11, now we can do any of out basic chord manipulations easily by adding or subtracting 1 from the appropriate note so our minor would be just adding 3, 7, and 11 to root note number which gives us 60, 63, 67 and 71. So the basic patch for a Major 7th would be as simple as,

Now go make it play minors, suspended and augmented chords in major and minor keys and if you feel ambitious, make it play in key so you get the proper 7th!

@chopin83 Expanding on what @oid said, you can use [text] to switch between chords.

In this example different chords are stored in [text] and the mode can be selected via radio buttons: chords.pd

@ingox You should at least charge them if you are going to do their homework for them

@oid and @ingox and @whale-av thank you so much ! I will read through all the instructions you've provided carefully and try to come up with something at least functional ! Glad to see the community over here seems to be active and helpful ! it's a blessing to have this kind of help available nowadays !