Measuring the signal at the FEE64 end.

+5v , -6v , +7v, +7v 

The two other 'scope channels are connected by FET probes to the FEE64. I now see there is a ground connection.... so i will remove it and re-measure the signals in the filter.

 No real difference.

Measuring at the FEE64 and the spikes when the Mux ADC is reading out have disappeared.