Midi through -> Midi messages passing from the Synth input to the Synth output

What is the problem?

Polyend Synth doesn’t seem to pass midi messages from its input to its output. A midi thru implementation would be nice.
For example, use the Synth to play external synths/modulars and use a sequencer (Polyend Play) to sequence the Synth engines and/or the external synths/modulars.

What should this feature achieve?

Transmit midi messages from the input to the output.

Are there any workarounds?

Use an external midi splitter…

Any links to related discussions?

Any references to other products?