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Good morning (here.)? I do have my QDX functioning with FLDIGI just fine.

First, the sound since that seems to be where you have a problem:
Configuration
? ? -Soundcard
? ? ? ? -Devices
? ? ? ? ? ? Check "PortAudio"
? ? ? ? ? ? Both Capture and Playback should be "QDX Transceiver" which is also "USB Audio (hw:0,0)" on my system.? Click "save"

Then for CAT Control you can either use FLRIG or use Hamlib so you don't need FLRIG open.? I chose Hamlib this go-round.? But since you have CAT and PTT I'll leave that alone.

If you set up your soundcard correctly in FLDIGI and still don't have a waterfall, try adjusting your waterfall gain.? On the bottom left of the screen, the first number is the upper signal level and the second is the range.? Try increasing the range and decreasing the upper signal level.? Then make sure the bottom right number is set fairly high (or maximum.)? That is your TX gain.

Joshua