Softcomm ATC-4PS intercom pinout needed

[Wingman12]

Softcomm seems to have gone out of business years ago. I have a Softcomm ATC-4PS four-place stereo intercom in my M4 but it had only ever been wired for the pilot & copilot intercom/jacks. I want to add the wiring for rear-seat jacks but I do not have the pinout diagram/labeling to know which jack wire connects to which intercom connector pin. Does anyone have the pinout for this intercom?

[onfinal]

Hi Wingman,
This might meet your requirements.
Text on the 'Panel Mount Intercom' indicates the two,four and six place versions.

[Wingman12]

Excellent! Thanks very much onfinal!!