DC-5 Channel/EQ/Reverb Pedal Discussion

Since I discovered that my marshall 2-button pedal doesn't work on my DC-5a combo, I've been doing some research on the channel, reverb and EQ pedals for the DC-5. From posts here and elsewhere I've gathered that the DC-5 (and some other Mesas) uses pedals that contain a specific resistor and other pedals won't work. I'm hoping to get a concensus here on which pedals (channel, eq and/or reverb) require a resistor and where in the circuit they exist.

According to the Mesa/Boogie online store (http://mesa.stores.yahoo.net/dcsers.html) the early DC-5(a) has a single button FS for the channel and dual button for reverb/EQ. The later DC-5(b) has a single button for reverb and a dual button for channel/EQ.

So far, thanks to lockbody (http://forum.grailtone.com/viewtopic.php?f=28&t=38292&p=282626&hilit=footswitch+schematic#p282626) I have this picture of the inside of a single button Mesa DC-5 footswitch which shows a 3320 Ohm resistor between the tip contact and the lead to the LED (NOTE: DC-5 pedal is on RIGHT):


What I find confusing is that he used it for his EQ, not to switch channels as I believe a single button pedal would be normally used for in a DC-5a (or for reverb in a DC-5b).

I'd love to hear anyone's take on any of this. Any thoughts or information is appreciated.

No, I use it to switch channels only. I use the EQ auto function because I only care for the EQ on the lead channel.

The problem was that the EQ was always on for both channels when using anything other than the correct switch, no matter where the selector switch was. Therefor, when I got the correct foot switch "I got my EQ selector back."/