Mick,

I'm noodling a bit here.

If midi inputs from the keyboard to Realband with TChelicon
already setup for your desired results.

I think you could play your sax to RB track treating it
as though its a vocal and harmony would be generated.

Two weakness in this noodling.

First....
First of all the key of the board player would have to match the
key your playing it I think.

Second...
Your Sax track/s output would have to be run to the amp/s your using.
All of the midi tracks would have to be turned down to Zero thruput.

Third....
You have to have a laptop in equation... Assume due to software request
you do...
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I had been tinkering with TChelicon harmonizing a realtrack and it worked
just fine.

Short sample using TChelicon without any midi harmonizing against a realtrack.
This was setup with 1 down in TChelicon.
http://www.pgmusic.com/forums/showflat.php?Cat=0&Number=383623&an=0&page=0#Post383623

It might be possible to simply setup RB TChelicon,
play your Sax to a track as tho recording thru TC and to audio outputs.
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I have a Yamaha PSR-3000 with harmony built in for realtime use.
It can read either the Chords, generating selected harmony.
Or it can read the upper keys and harmonize against them.

Only cost me a bit of time to make these noodles, so nothing lost.

Good luck!

FrankB

Down The Street vs2015 12-03-2014
Win7, AMD QuadA8-5500,16GB,2TeraHD, Komplete 10
PG Ultra Plus 2016,Alesis 12USB, Sonar Platinum