Dual tap tempo switch???

[sailtothestars]

Hi.  I'm a forum newbie, and I have a question about a crazy idea I have.  I would like to run two Boss DD-5's (which I have modded) in parallel with a single tap tempo controlling them both.  This way, I can have a quarter note delay on one unit in stereo with a dotted eighth delay on the other (i.e. U2's "The Edge").  In order to do this, I need a momentary switch circuit that shorts both tap tempo lines to ground when the switch is depressed (like the Roland FS-5U switch, but with two circuit paths and two inputs).  A single tap tempo circuit, as far as I can tell, looks like this (I need one that will work on both DD-5's at the same time)...

DD-5 Tap Tempo Jack  --(single 1/4" cable*)-->  Mom. Short to Ground

 * tip is positive/sleeve negative

What kind of switch would I need to do this?  The FS-5U uses a DPDT, I believe, but it needs this for its "polarity" switch (makes it a momentary "making" circuit).  Any suggestions on a circuit design/switch to do this?  Any replies will be most appreciated.  Thanks!

-- Matt Shasteen