Norwich Organ

[diapason]

Having recently moved into a modern house, I have had to sell my pipe organ - to a very good new home - and have acquired an old analogue Norwich Series 70 in a lovely drawstop console as a home practice organ.  I now have it all set up and working - thanks to Martin Russell from Eminent UK who sourced this for me and helped with a minor power supply repair).

I wonder whether anyone knows whether it's possible to adjust the output volume of the Great and Pedal - for the benefit of my neighbours - and, if so, how to do it.