Vintage Synth Repair

hi there, i have recently acquired a pianet N in near mint condition.  one problem im having is that the pianet will not sound without the volume pedal plugged in, which i unfortunately do not have.  its the 5-pin volume pedal's input on the pianet itself that needs to be shorted in order for it to work without it, either jumped across with wire or with a resistor.  not exactly sure but if anyone has any idea it would be greatly appreciated.



-mike