Midi Thru - Arduino Midi Lib 4.2

Hi folks
I'm fairly new to arduino and trying to work out the syntax for setting the MIDI Thru Filter mode.
I've looked at the documentation and searched google but can't find an example.

MIDI.turnThruOn(); verifies OK but MIDI.setThruFilterMode(DifferentChannel); errors with 'DifferentChannel' was not declared in this scope.

Any help appreciated.
Thanks.

but MIDI.setThruFilterMode(DifferentChannel); errors with 'DifferentChannel' was not declared in this scope.

Yes it appears that it is not actually implemented. I can across that a few months ago. I did tell the author but got no response on that point.

Thanks Mike.
It's not a show stopper but would be nice to implement.