What filter do you recomend for an IC-706MKIIg for RTTY and soundcard use for PSK31 and other narrow modes? I have a new IC-706MKIIg and would like a better filter for use when I do rtty and other narrow modes. My 756 PRO II has spoiled me and I miss the narrow filters for RTTY!!! Thanks! Gordon LaPoint n1mgo at arrl.net