That makes sense and I should at least try that first. I would probably wind up fiddling around with individual regulators anyway, due to changes in paints and viscosities.
Chicago Airbrush Supply sells the “T” adapters. I have two airbrushes hooked up to one compressor. You can turn one off at a time or just leave the valves on for both, allowing you to rapidly go from one brush to the other, down line from the regulator, and moisture trap.
That’s where I bought my Infinity, and Paasche QD nipples. I should have added the manifold.
On my part. I always have one project at a time. So its very rare I use more then 2 airbrush. On one time I will start with my Iwata HP-TH for priming. Then on the next day, I will use my Iwata Custom TR for base color. And the following day, I will use my Iwata Eclipse for any accent color. And lastly using my Iwata CM-SB for weathering.
i967.photobucket.com/…/AirbrushCompressor_zps853fb96d.jpg
All using one regulator. But what I found out. I bought 2 piston Iwata Compressor for longer spraying ( like the Polar Lights 1;350 Refit Enterprise. ) And a smaller 1 piston Sparmax for shorter spraying for 1:72 scale models. This compressor can be interchange with my single tank reservoir with a single regulator. And I don’t see any hustle in changing the air pressure every time. I change my airbrush. IMHO.
JunJon,
That seems to be the consensus, that it is no trouble adjusting pressure. That being the case, I might only have one air hose with a MAC valve having a QD. Maybe I’ll just rack my brushes by the regulator on the bench and plug them in one at a time. I probably will find that I only need two favorites 
Scott,
Give it a go. I have only one pressure for the Eclipse, TR and TH. But for the CM-SB, as you can see there’s a MAC valve connected to the QD.
After years of using all kind of different setups, I have finally found one that I’m feeling almost satisfied with.
I have a fairly large, but decently quiet compressor. It has its own regulator, but I have a desk mounted regulator as well, that I use for setting the pressure. This is in my opinion a better solution than the Mac valve variants, that I’ve been using earlier. Not only because it is larger, but also because it will not make the airbrush heavier or clumsier as all the hose mounted or between the hose and airbrush versions are.
I have five different hoses, each with a quick connect, that connects to the desk mounted regulator. This way I can switch between up to five airbrushes, and nothing heavy or clumsy on the airbrush side, and full control and easy access to the air pressure.