When I have 2 Keyboards, is there a way to colour them differently, i.e. through Engine.setKeyColour() ?
My problem is that each keyboard has another Samplemap loaded with different missing samples, which I want to highlight with a red colouring. Do you think it's necessary to use CustomGraphics to achieve this?

Here's an example-code, which only colours both Keyboards:

const var Keyboard = Content.addFloatingTile("Keyboard", kbposx, kbposy);
Content.setPropertiesFromJSON("Keyboard", {
  "width": kbwidth,
  "height": kbheight
});
Keyboard.setContentData({"Type": "Keyboard", "LowKey": 31, "HiKey": 84, "MidiChannel": 1, "CustomGraphics": false});
const var Keyboard2 = Content.addFloatingTile("Keyboard2", kbposx, 450);
Content.setPropertiesFromJSON("Keyboard2", {
  "width": kbwidth,
  "height": kbheight
});
Keyboard2.setContentData({"Type": "Keyboard", "LowKey": 31, "HiKey": 84, "MidiChannel": 2, "CustomGraphics": false});
const var missing_list_1 = [31, 36, 43, 50, 55, 57, 64, 71, 78, 84];
const var missing_list_2 = [34, 35, 39, 59, 68, 79];

function markMissing(miss_list) {
    reg i;
    for (i = 0; i < miss_list.length; i++) {
        Engine.setKeyColour(miss_list[i], Colours.withAlpha(Colours.red, 0.3));
    }
} // this function will be called with one of those arrays as an argument

Thanks in advance, any thoughts on this are appreciated!

I've noticed it while looking up something in the section Scripting/Scripting API/Content, here's a link, also 404 for the other subpages: https://docs.hise.audio/scripting/scripting-api/content.html#addaudiowaveform

Since a while it's not possible to access important parts of the Docs properly, especially in the Scripting/Scripting API/Content section is filled with 404's.
Is there some backup online or could someone upload one? I also couldn't synchronize it in HISE.. Thanks in advance!

Unfortunately, it doesn't seem so yet..
But if I could create ProgramChange-Messages internally to act as a trigger (w/ Message.isProgramChange()) or to save it inside a sequence to a MIDI File (w/ MidiPlayer.saveAsMidiFile) it'd already be helpful, as I could route some data to another Instance sending the corresponding MIDI-Data to an Output. Even a simple print of a triggered ProgramChange-Message to the Console would help me to demonstrate some things.
Is there any way to realize one of these methods?

Is it possible to send Program Change Messages with the click on a button?
Unfortunately, I didn't find an answer in this forum yet and the Docs return some 404's.
Thanks in advance !