Hi everyone,

I've been playing a bit with a Csound handpan synth from here and I've used the r_cycle external to make a handpan with my Launchpad (the patch is not very complicated so I didn't try to make it neat, sorry!).
The csound patch maps specific MIDI notes to the synth according to a scale, and the Pd patch lights up the pads so each colored group of pads sends the corresponding MIDI note to CSound:

I'm super happy with it, but the next step is to make it configurable: the csound patch contains many different scales defined with giNotes = ftgen(0, 0, -<number of notes>, -2, <list of note numbers> ) :

; B Kurd
;giNotes = ftgen(0, 0, -10, -2, 47, 54, 55, 57, 59, 61, 62, 64, 66, 69)

; B Golden Arcadia
giNotes = ftgen(0, 0, -9, -2, 47, 51, 54, 58, 59, 61, 65, 66, 68)

So instead of editing the CSD file and changing the color mapping of the launchpad when I want to change scale, I would like to send a list/array/table of note numbers from Pd to [csound6~] via a message (and adjust the MIDI notes sent by the launchpad at the same time).
I know basically nothing about Csound, so I've read up and found examples using chnget/chnset or invalue which seem relatively straightforward to change the value of a single int variable. However I don't really have any idea on how to pass the list/array of scale notes using chnset or invalue, or if there is a better way to do it.

Maybe someone around here has an idea? Thanks for reading so far in any case

@zigmhount My Csound is abit rusty but a quick look over the csd. The scale is just an ftable in the score and we can change that with the [event( message, but you would need to rework the Instr Setup function at the end of the csd to work with values directly from the score's ftable instead of the scale definition at the start. This should allow you to send your scales from pd. The Csound Floss Manual should be able to help, sections 3-D and 9-A being the pertinent sections but you may need to run through the section 2 and the first parts of section 3 just to get the basics down, depending on programming experience. There is also a rather slow Csound forum that may provide better help. Csound is really great for audio generation and fairly simple to learn, it's biggest issue is the insane number of ugens can overwhelm.

@oid Thanks for your answer.
I followed your advice and spent quite some time learning a bit how Csound works - a bit overwhelming indeed.

Then I realized that I'd love to be able to play this synth when connecting my MIDI controller to my smartphone, so I tried to run a slightly modified version of the CSD file on Csound for Android, but I didn't manage to get anything but crashes. Then I tried with csound6~ as a Pd external on PdDroidParty and MobMuPlat, but externals of course don't work on these. Then I considered running Linux on old smartphones and tablets, but I couldn't properly access the soundcard without root access. Then I fell back and looked for handpan soundfonts, but I could find only 1 or 2 (for free) in a single scale.

Then I finally came back to Pure Data and realized that my best chance was to convert this Csound patch into Pd vanilla and run it on MobMuPlat.
Which I've done! yay!
I've had quite a few challenges and the sound isn't perfect yet, but it works, and I'm also adjusting a few things to my preferences. I'm also including the r_cycle functionalities to tune the Launchpad and it's a lot of fun! I might be able to spend my Sunday sitting in the grass and playing handpan on my MIDI controller connected to my smartphone
I will push it to Github eventually, right now it's still a little too messy for sharing, but if anyone passing by is interested, just let me know!
Cheers!