>"With that, what filter should I go with to maximise my CW experience?" I ordered the default 2.7 kc 5-pole and added a 500 cycle 5-pole for CW, and the performance is far beyond my expectations. Most of the time I operate CW with the DSP set to 300 to 500 cycles, so the 500 cycle roofing filter is always in the circuit when I'm operating CW. Paul N4LCD