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THIS IS THE #1 CULPRIT WHEN DIGITAL MODES WILL NOT TRANSMIT!!!
Fixes:
Check to see that USB Audio Codecs are selected:
1. In FLDigi: Configure/Soundcard/Devices
2. In PC: In toolbar, right click on Speaker Icon. Select Open Sound Settings. Make sure Audio Codecs are selected for both Speaker and Microphone.
3. For UHF/VHF: Signalink TX knob set at 3 o'clock. (This can be a fix if you've been operating with the TX turned down to minimize ALC for HF)
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When using FLAMP with FLDigi:
Make sure both are "sync'd" in the first two check boxes under the Configure Tab in FLAMP.