Hi,
I was trying to make a program change button but it seems that the VST is using bank and sub bank instead of 0-127, is there any way to make it work ?
I checked with Protokol value that I am sending seems ok.
If I’m not mistaken to send a bank select message you need to send a CC0 followed by a CC32 : http://www.mamosa.org/jenfi.home/utilitaires/midibankselect.php (FR)
I made a button with this scrip :
send("midi:virtual_midi", /control, 0 1)
seems to be incorrect.
/control needs to be enquoted, 0 1 are two distinct values and should be separated with a coma.
so this should send me control 0 in midi channel 3 ?
send("midi:virtual_midi", "/control", 3,0 )
I even tried this :
send("midi:virtual_midi", "/note", 0 )
both are note woking 
Control changes require a channel number, a control number and a value; notes require a channel number, a note number and a velocity value. (https://openstagecontrol.ammd.net/docs/midi/midi-messages/)
send("@{variable_midi_out_port}", "/control", 3,0,0)
I fall asleep like 10 minutes laters …
I tried to send midi control to change the program didn’t managed to, find a less elegant way to do it
send(get("variable_midi_out_port"), "/control", 3, 0, 0)
is better but you got it 
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Yes we have to prefer get() instead of @() in script !
So actually how do you send the two midi messages then the control message with one press ?
I'm interested 
I didn’t managed to do it
maybe I’ll try later
simply :
send(get("variable_midi_out_port"), "/control", 3, 0, 0)
send(get("variable_midi_out_port"), "/control", 3, 32, 0)
But now I don’t know how to send the program change
ok i suppose in the script field.
how to send the program change is a very good question ?
The doc proposed to send a /program message so i think you have to add the message to the two others at the end.
PS : a ressource about midi https://www.noterepeat.com/articles/how-to/213-midi-basics-common-terms-explained
That's it.
So consider this : a helm synth and o-s-c to send it a program change.
Is it the good way to get helm to change synth ?
edit : the channel 3 is used
seems to not working as expected.
Edit : for helm, note from here https://github.com/mtytel/helm/issues/175#issuecomment-554004251
midi_cc 0, bank #midi control channel 0
midi_cc 32, folder #midi control channel 32
midi_pc, patch #midi program change
Tried with Serum not working to I think it’s a problem of bank and sub bank
send(get("variable_midi_out_port"), "/control", 3, 0, 0)
send(get("variable_midi_out_port"), "/control", 3, 32, 0)
send(get("variable_midi_out_port"), "/program", 3, 0 )
Edit :
For serum I’ve found an other solution by creating a programchange.txt files in the /System
then list the preset so you can use a 0 to 127 standard program change
send(get("variable_midi_out_port"), "/program", 3, 0 )
What's expected exactly ? If O-S-C sends the MIDI messages, then I'm afraid I can help more here.
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yep it’s more an Helm question now. but it’s interesting to get the whole communication works no ? In my screenshot i am not sure i check the good value for helm to receive the midi signals from o-s-c. So it’s a o-s-c question . Sorry @zoltan to spam your post.
Ah si ! Can we send a control message to all the midi channel with an * ?
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No you can't
You can check what o-s-c sends from the launcher's terminal when debug is enabled.