Crumar Multiman-S / Orchestrator Sustain/Swellpedal

Hello guys

Does anyone know how the sustain/swellpedal of old crumar instruments (im my case a multiman-s) is wired? i’m having trouble trying to make it work and cant find the schematics anywhere…

Thanks so much for your help!
Sam

The service manual with that information can be downloaded here;
https://www.synthxl.com/crumar-multiman-s/