fldigi sounds the same as 2Tone as it starts up, so they may operate in a similar manner. 73, Ken, AB1J In a message dated 2014-02-26 12:16:05 A.M. Coordinated Universal Ti, chen at mac.com writes: I have been told that fldigi is doing the same thing, but don't have first hand knowledge. 73 Chen, W7AY