Echoplex foot controller sharing?

[Travis <tiktok@sprintmail.com>]

Has any one used an A/B box to allow one Echoplex foot controller to 
control two EDP independently?  I know Dennis Leas built his own 
controller with a built-in A/B 
(http://www.loopers-delight.com/LDarchive/200110/msg00544.html), but 
I'm looking for a commercially available A/B box to allow the same 
thing.  Kim said that a passive box would work, but I'm looking for 
someone who's actually done this and can provide specific model info or 
suggestions.  The archive appears to run pretty dry after this.

So far I've tried a Rapco AB-100, which is a passive ABY (each channel 
has its own on/off switch), but when I switch A or B off, it resets the 
loop, as if I'd done a long-hold Record push.  I also tried a Whirlwind 
Selector, but neither EDP would recognize anything from that box (which 
does have some sort of optical switching circuitry, and requires power 
to work, so I'm suspecting it's less-than passive).

I don't want to use MIDI for this purpose, and again, I'm not using 
them for stereo pairing, so I want total independent control of each 
box, one at a time.

Thanks,

TravisH