Lots of disxussion on DSP--yes--no. I READ THAT IF THE KI02 is set up properly a DSP would add little to the filtering. I have read in several places that the Autek QF-1A or the SCAF-1 does a swell job for making a pleasing SSB sound with out big expensse..Comments http://www.norcalqrp.com/contest/qrpttf2002/K0ZK.html http://www.eham.net/reviews/detail/3075?ehamsid=c0d8a740510634d72d12067d309d98 dd Thanks---Alan KB7MBI