> Completed K2 +3000 a few weeks ago and > realized the side tone has three extra blips per spectrogram. The 3000+ K2's already have a mod that clean up the sidetone. Are you sure you are not overdriving the PC's soundcard so that harmonics are generated there? It is very easy to do. -- 73, Sverre ------------------ Sverre Holm, LA3ZA www.qsl.net/la3za