I think there is a bug in Qtsoundmodem version 0.0.0.71 Beta. After noticing difficulty connecting at 300 Baud accompanied by a slightly different ax25 noise I noticed that the Both Tone Calibration sounded distorted. Unlike the clean Both Tone of the UZ7HO soundmodem.?
?I downloaded Qtsoundmodem.exe v0.0.0.61b and the problem was fixed. Calibration Audio Clean tones. I don't know if the problem was on my PC but I preferred to let you know so you can check it out. I'm sorry if it was my mistake.
Mauro Veiga