is anyone aware of a software midi merger utility for Windows? I have 2 physical midi controllers on different ports that I want to appear as a single device inside GP
I‘m assuming there is a reason for you to have the two represented as a single device. But what is it? For many situations where you would use this, there are other ways to do this 
But answering your original question:
You could use an additional GP instance plus a MIDI loopback device.
What about LoopBe1?
Midi osx maybe u can try.
I’ve found LoopBe30 (and the free single channel LoopBe1) to be good tools. I didn’t experience any noticeable latency, like I did with loopMIDI.
@simon - yea, tbh, it’s something I’m trying to solve for to make creating a bunch of racks a bit easier. I’m using a GSI DMC-122 (dual manual midi controller) as my keyboard and a modified Behringer FCB1010 foot controller for all of my pedals (sustain, expression, patch change, leslie, etc…). I was looking for a shortcut of being able to just have a single device to add to a rack (and filter by channel). I know there are other ways of doing it, but I’m trying to keep things as simple as possible for setting things up. Especially if there is a way of going in on the backside and changing the ports in case I needed to swap out part or all of my controller rig.
@progloverfan - MidiOX was the first thing I checked, but I couldn’t figure out a way to do what I wanted to.
@themaartian - thanks - I downloaded LoopBe1 and will look at the documentation to see if it can do what I want it to do.
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Make sure you read up on the Rig Manager, which is designed to support precisely this.