These type of fan controllers work off of thermistors that are pasted to the heatsink. The Antec Smart fans have this capability built into them. With that said, you could handmake a baybus to control multiple Smart fans, reducing the RPM spread via a pot on the front of your machine. Example:
At 12V your fan will vary from 2000-5000 RPM depending on temp. Lets say you want it quieter, though, so you wind down the pot.
At 7V, your fan will now vary from 1300-3800 RPM, keeping it quieter.
With the Smartfans, it may not be necessary to put on a pot relay at all ... I don't know of a commercial baybus that will do what you want any better than the smartfan design alone, though if you are really anal about control you can add the pots.
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