[OXO cube]

i have Parma controllers on my home track 
and a DS controller for club track 
but since Pendle club closure , i have no use for the DS controller unless i travel , which due to work commitments is not really possible 
my problem is .... the club track was -( negative) polarity , and my home track is +(positive) 
a problem i didnt realise i had , until i tried the DS on my home track 
my question ..... is there a way i can easily rewire my track / Parma controllers / DS controller so that they would all work on my home track , and the direction of track travel would remain the same ( this point is most important ) ?
i tried swapping wires etc , but quickly became confused , so returned everything to original and just continued with the Parma's , but the option to use the DS would be great if possible 
i am reluctant to mess with the DS , but the Parma's and track wiring are more to my 'tin pot' electrical standard 

any help is appreciated 


Kev