also,
here is some info i copied from a post from another group regarding audio problems from qsstv.:
Make sure nothing else is using the device, for example, you can't have WSJTX running at the same time as QSSTV. It needs to be shut down.
In order to identify the correct device, I first disconnected the radio from the PC and made a list of the devices under the Sound tab. I then connected the radio and made a note of any new entries that popped up. Armed with that information I was then able to connect to the radio using Alsa and was able to receive.
If you are controlling the radio using the Hamlib interface (Enable Hamlib Cat Interface), the WiKi has a note to say that for Kenwood radios you also need to select CAT(Data Port) . Came across that while trying to figure out how to remote control my radio.
Another option with sound is to use PulseAudio. I am using Linux Mint and when I select PulseAudio I can then go to the menu and launch the PulseAudio Volume Control and QSSTV will be listed in both the Playback and Recording tabs. It is then a matter of selecting the correct audio device on each tab and setting a level. Also look at the Input and Output tabs for the actual device level settings. I just set both to 100% and then the level for QSSTV on the Recording and Playback tab.
73
David
ac9xh