[bikerhifinut]

To add to this, and RW david has it bang to rights.

I made a connecting lead up with my own attenuator fitted into the RCA plugs on the input. If you use a decently sized plug here you can easily fit a couple of quarter watt metal film resistors inside for a nice neat job.
I'd first rig a 50 or 100k potentiometer up into the input and then rotate it until you find your optimum attenuation for use with your preamps. Then its a simple matter of the multimeter and get a air of the nearest preferred valuse to make the permanent attenuator.

This has reminded me that I scribbled out a plan to use a small project box that I could somehow fit a pair of RCA plugs spaced just right to plug into the leak phonos and have a pot inside the box connected to a pair of RCA sockets. It stumbled due to scratching the head on how to fit the plugs but i think its do able if the correct nuts can be found to screw the plug bodies in to the box.

Andy.