I liked the 'UT-106' DSP-option from the Pcr-1000 for its automatic
multi-notch only. This unit also works in the Icom 706 TRX-series

That *is* the icom DSP that is in the 706..
Some other icoms too...
That was an option on the 706mk2, and standard
on the 706mk2g. MK