How do I qualify the "if" to just include all of the messages, as there is no "else".

Flip it around. The default is to let a message pass. So your if should be to stop messages passing.

As an example, this will allow all notes except middle C to pass through the on note on.

if (n == 60)
{
    return Message.ignoreEvent(true);
}

Message.sendToMidiOut();

@VirtualVirgin said in How do I send MIDI to the MIDI output?:

Is there some function to route all of these directly to the output stage?

You need an if statement (or possibly more than one, or a switch) to check what message is coming through, and only if it's one you are interested in do you do anything with it, and let the others pass through unaffected.

So I'm trying to figure out what this means.
I need all of the MIDI messages to proceed to the output. HISE is blocking them by default at the output unless the "Message.sendToMidiOut( )" is present for the messages.
How do I qualify the "if" to just include all of the messages, as there is no "else".
I don't need to filter any of the messages here.
I only see references in the API to Program Change and Aftertouch, but not for the plethora of other messages which can be transmitted. If noteOn and noteOff and Controller need explicit references to send to MIDI out, then I also need explicit references for the other messages? How do I tell it to forward MTC or MIDI Clock to the output if there are no API references to them? Is there a term to refer to all MIDI messages?

Is there some function to route all of these directly to the output stage?

You need an if statement (or possibly more than one, or a switch) to check what message is coming through, and only if it's one you are interested in do you do anything with it, and let the others pass through unaffected.

@VirtualVirgin set the

Message.senToMidiOut()

on all the midi callbacks, onNotOn, onNoteOff and onController
all cc pass the onController callback

Thank you :)

So, this works, but it does not cover the full extent needed for a MIDI plugin.
When testing, my VSTi now passes the transposed note on and note off messages properly, as well as passing on any CC messages, but a MIDI plugin needs to act as a thru for any remaining MIDI messages.

So I still need to get Program Change, Aftertouch, Pitch Bend, Bank Select, MMC, MTC, MIDI Clock, SysEx etc. forwarded directly to the plugin MIDI output.
Is there some function to route all of these directly to the output stage?

Message.senToMidiOut()

on all the midi callbacks, onNotOn, onNoteOff and onController
all cc pass the onController callback