In a monophonic sinthesizer, If we connect the [notein] directly to a [mtof] and then to an oscilator, the effect is not always as expected. Sometimes the note off message turn off a different note that we would like.

The system should store the penultimate key pressed, and play it again when release the last one. But in some cases the player can also release that penultimate key (while the last key is still pressed) and the priority should transferred to the antepenultimate key... and so on.

So, we need a patch which can memorize at least the 10 last notes and make this work for us.

notein_mono.pd

The explanation of how does it works will be uploaded soon in my youtube channel:

I've built a monophonic synth some months ago that reproduce this behavior :
http://forum.pdpatchrepo.info/topic/8108/the-miniwoog/3
Check the input subpatch in the keyboard subpatch (not so clear when I think about it). It writes the keys pressed in a table and output something as long as a key is held.
Note that you can choose low / high /last note priority with kbd_mode in the main gui, like it is with some classic analog synths.