Hi, You will not be able hear audio, as there is no built in microphone on the QQ190RTF. Also- TBS gear such as the cube in the QQ190 uses smart audio for additional UART inputs, which uses the audio channel.
More info on SmartAudio:
SmartAudio is a protocol developed by TBS for OSD to VTx communication. All newer generation OSDs at TBS, and all UNIFY PRO series VTX support SmartAudio V1.0, with the UNIFY PRO HV line we have launched SmartAudio V2.0. The new version supports control for the new features (e.g. PitMode). SmartAudio is a single-wire UART protocol, running over the Audio-wire.
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