@Glop-Glop you could use a data structure and scalar as a receiver for a click, that sits behind the array graph but still allows you to edit it and then a line object for a bit of a run-on to update the other array
array-update.pd

@Glop-Glop The errors are caused by not having a number for the y position in the array xlabel, therefore the label elements do not match
To fix: search using find for pd, this will show 1 of 2 sub patches [pd seq_temp resize] then find again for 2 of 2 sub patches [pd random_temp resize]. Open each sub patch and insert [list prepend 0] between the list object and [list prepend xlabel] in each sub patch as below

Edit: in fact -.1 is better for seq_temp and -4 for random_temp

@Orangery Yes, sorry about I hadn't tested it and the numberbox outlet was not connected to the [+ ] object, but worse than that was the random notes cause some notes hang when playing more than one note if playing polyphonically. The best I could come up with to address that, was to count the note-on and note-off and when sum was zero perform an all notes off (cc 123).
out-of-tune-3.pd

@Orangery try adding these

@dreamer I was just checking about the dsp when you posted, and you are right of course Thanks again

@dreamer Solved, updated plugdata to v0.93 and I think I needed dsp on to run the metro. Anyway thanks for great product

@Orangery I'm not that good on music terminology, but here I've added an hradio of 13 cells that when set greater than zero will also play a note that many semitones above the original at the same velocity
out-of-tune-2.pd
I've just noticed today when you first open the plugdata.vst edit button there is a plug icon to enter plugin mode

@dreamer I have followed the instruction on sites you directed me to and compiled the plugin. I loaded it in vsthost but it doesn't output anything
What do you think is missing?

@dreamer please don't take offence, at my age I need all the safety precautions I can get, Anyway I just checked and the whole toolchain business is all intact now so I tried to compile it. the vst has no inlets or outlets or Gui, I guess it doesn't like me

aha! @dreamer now I see why McAfee keeps quarantining heavy.exe, It's trying to protect my sanity. I don't think I'll bother