Configuring your FT-991A for using the USB Port Audio with VoiceMeeter Banana.

A number of menu configurations must be set in order to the radio receive the computer-generated audio and transmit it properly.

Audio source & CAT/PTT/MOX routing

Menu Item	Value	Why
045 AM Mic Select	REAR	In a CAT/MOX TX event while in this mode, where does the audio comes from?
048 AM Port Select	USB	Toggles between USB port or the DATA/RTTY port (TNCs). We want USB
070 Data In Select	REAR	In a CAT/MOX TX event while in this mode, where does the audio comes from?
072 Data Port Select	USB	Toggles between USB port or the DATA/RTTY port (TNCs). We want USB
074 FM Mic Select	REAR	In a CAT/MOX TX event while in this mode, where does the audio comes from?
077 FM Pkt Port Select	USB	Toggles between USB port or the DATA/RTTY port (TNCs). We want USB
106 SSB Mic Select	REAR	In a CAT/MOX TX event while in this mode, where does the audio comes from?
109 SSB Port Select	USB	Toggles between USB port or the DATA/RTTY port (TNCs). We want USB

IMPORTANT AND FRIGGIN READ AND UNDERSTAND THIS

Notice that these settings will inhibit your front port mic.

However, it is possible to have the front mic port available as well - Move the Mic Select clauses to MIC. But, if you command a TX event via CAT command, the radio will expect audio from the front port. If the TX event comes from the footswitch or Digital Vox, then it still transmits from the USB port.

Then, if you won't be using CAT for voice TX (using Digital Vox or Footswitch instead), it is 100% OK to leave clauses 045, 074 and 109 in MIC. I do (since I have a footswitch).

VOX

Menu Item	Value	Why
142 Vox Select	DATA	Otherwise, the radio will expect the audio to trigger the VOX mode to come from the front Mic port
146 Data Vox Gain	90	I found the Digital VOX to be few sensitive - so crank up and avoid drops in middle words
147 Data Vox Delay	1200	This is for how long VOX stays active (in milisseconds; meaning 1.2s) after last peak stimuli - For how long VOX stays up after last voice peak. Having for too short, you are going to be cut on short silences and umm/errr/ahhh etc; too high vox stays on for a long time after you stop talking.

Convenience / optional

Menu Item	Value	Why
026 Beep Level	15	Reduces the button press beep volume, isn't it too loud?
036 TX TOT	7min	Avoids stuck mic and you transmitting a scene over the air (for so long)
059 CW Freq Display	DIRECT FREQ	Avoids shifting frequencies by 900 Hz when switching different modes, like USB, CW, FM, etc.
110 SSB TX BPF	100-2900	Widens the audio gamut that you can transmit, enabling more bassy audio.

Next up:

4. VoiceMeeter final configuration