I use fldigi for psk on the sbitz v3. just need to make sure your in digital mode and change the pitch on the sbitx software to the signal coming in on psk on fldigi.
I find if you change the screen size to medium you can get both the sbitx and fldigi software up together. Then it is easier to see the psk signal on fldigi and change the pitch on the sbitx control software.
