Maybe I missed it, but I don't recall seeing a simple EQ plug in like is on many P.A. heads (such as a Peavey XR series).  I have and have seen all kinds of fancy graphic EQ's, parametric EQ's, etc.,  but not just a plain old EQ with Low Mid and High controls.
 
 
 

Check out the Blue Tubes plugs

Here's a free one:
http://www.kuassa.com/products/basiq/

mikedocy
Here's a free one:
http://www.kuassa.com/products/basiq/

 
Actually, that's not quite the same thing. The shelving emulates a Baxandall shelving-type EQ like what you find in hi-fi amps. The Peavey one uses a peak/notch filter and conventional shelving. Maybe I should make an FX chain  - wouldn't be too hard to emulate an XR series EQ.
 
Meanwhile, maybe the graphic EQ in the Anderton Collection will do the job for the OP. It's a little more complex than a three-band EQ, but it's quite straightforward.
 

Craig I've got one that is similar to yours.  Anything else you can do will be appreciated.
 
Mikedocy, I'll give your suggestion a try.  But I don't think its the same type as used on a P.A., such as a Peavey XR600F.
 
The Nomad BT EQ's all more complex with frequency settings.

sonimus have a nice freebie, but it's 32bit only http://sonimus.com/products/soneq/

Here is an FX Chain preset based on the info in the XR600F Owners Guide XR600F EQ.fxc

Yup, that's it. However different XRs have different midrange frequencies, according to their manuals. The XR8300 and XR8600D give the mid EQ frequency as 450 Hz, as does the XR1212. This makes more sense to me as that's the "mud" frequency.
 
It wouldn't be hard to add a button that switches the mid between 450 and 850 Hz so you could emulate the two different responses.

Same FX chain with button to switch mid between 450 and 850 Hz XR Series EQ.fxc

scook, aka instant gratification.