Amp switching with 4093/4066. How to add indicator LEDs?

[Michael Allen]

I've added a Mosfet version of the fender trem (from Geofex.com) to my 5E3 build along with a one tube reverb. Both work well and now i'm building the switching box.

I'm using a CD4093 to control a CD4066 which does the switching. The power supply comes from the 6.3V heater through a voltage multiplier to give about 9VDC. The SPST switches are in the switchbox with a TRS cable to the switched TRS jack. I used this scheme instead of just using the SPST switches to manually switch the circuits off because I was getting some ticking from the Trem since in the switchbox both the reverb and trem have to use the same ground. I built a TRS cable from canare two pair individual shielded cable, with the reverb shield grounded. I also wanted to use solid state switching so I could add LED indicators to the switchbox.

This is pretty much right from the wicked switching article, but I can't use an inverter to drive the LED indicator for each switch since that would mean two more wires in my jack/cable which I don't have with a TRS. So I figured it would be as simple as adding a current limiting resistor and LED to the switch/gate input. Well, that lowered the voltage too much and pulls the gate input low no matter what. I know you can't directly power an LED from a gate output because it will pull the gate voltage low, so you need to use a transistor to control the LED. I tried using a transistor as an inverter connected to the switch, but that pulls the voltage on the inputs too low also. It seems I can't connect anything to the gate inputs or it will pull them too low.

The trouble is, using a TRS cable with this switching scheme the only things I can switch are the gates to ground. If I were using like 5 conductor XLR jacks or something then I could drive an LED with an inverter, but I want to stick with the TRS. Any ideas of how I can add an LED indicators to this system?