Passive TRS wiring schema

[merkaba22]

I posted this on TGP but there were no responses ... I thought I give it a shot here before I gave up on it being a reasonable inquiry for a newbie:

I have DMC-6D midi foot controller with a TRS jack for a built-in relay (for triggering latching switches) that toggles on/off selectively the tip and ring (+ sleeve/ground). My amp channel selection toggles with the tip on/off and the drykill of my Suhr Mini Mix II toggled is on/off by the ring but would not cooperate with a simple Y-cable (stereo to two mono jacks) -- presumably due to ground issues between the two devices.

I was inspired by the TRS splitter box ( http://www.loop-master.com/product_i...roducts_id=302 ) with a single TRS jack on one side and two TRS jacks on the other -- I knew I didn't know what I was doing, but can use a soldering gun, etc., the box was slightly too big and I thought I'd have "to get in there" myself anyway. So ... I built a splitter in a similar Hammond box to route relay messages from the foot controller . It works fine.


I also have a Soldano X88R preamp that has one 1/4" jack for each of its three channels to toggle on/off via a relay -- in the past I have used the Nobles MS-4 or the RJM controller via midi to trigger the latches, but wonder if I can extend the splitter idea to include controlling each of the preamps channels.

In the instance that my fool controller is programmable for the three (basic) relay states from a TRS cable:
Tip + Sleeve,
Ring + Sleeve, and
Tip & Ring + Sleeve

The first state is straight ahead, maybe the second too (otherwise the splitter needs to wire the ring to tip to work) but wonder if there is a passive schema to ensure the last state toggles the third selection rather than the combination of both 1 and 2?