So I built this DC voltage distributor.
This circuit actually requires no modifications to work with ±15v. A DC distributor circuit is ideal for using a single control voltage source to control multiple modules without loading the incoming signal.
when a signal is split into separate paths, the voltage stays the same but the current is divided. A buffer circuit relays the voltage through an op amp, but the current is supplied from the power source, rather than the signal source.
It's basically an input with 4 buffer op amp circuits. I assembled the circuit on a breadboard first--tested it with my modular power supply, then assembled 2 of them on perf boards and finally mounted them for my module.
Here's the module in my system (3rd from left on bottom row). I can now send a single gate signal to my ADSR module to shape my VCA in addition to sending the gate signal to my slew limiter circuit and then on to my VCF. (in a pinch, a slew limiter can be used as a minimal envelope generator.)
I also found this module to be helpful when I was testing the module I made after this, my joystick controller. having a buffer circuit that you can plug into immediately, helped me diagnose the problems with my joystick circuit. I needed buffers to keep the joystick circuit isolated from the loads I was plugging into it.