Some weeks ago I had a laptop 1.1 Ghz and fldigi 3.12.3 and jpskmail -win resulted in a jittering fldigi rx. Using XP. I went to fldigi 3.10 and the problem was solved. Now I try to set up a laptop XP 1,4 GHz for a fellow HAM and fldigi 3.12.4 as well as 3.10 are jittering. Any tip? 73 Paul PA0SON