Balanced input changes with Spectron Musician II

Does anyone know how to change the inputs from RCA to balanced with the Spectron Musician II Amp. I understand that there is a "special tool" to change internal switches.
Yes, there should be a special tool. If you don't have it then contact Spectron - they are very helpful.
All The Best,
The tool is inside the case. It is a small plastic rod with a loop on one end that grabs the dip switch.