voice meeter 991a voice chart - rfrht/Voicemeeter-FT-991A GitHub Wiki

Receiving Audio (orange stream)

1. The audio received by the radio enters the RX Radio bus.
2. The RX Radio bus jumps to the A1 Bus - which in its turn, it is the Headset Phone audio output.
3. And finally the audio is outputted only in the headset phone.

Transmitting audio (yellow stream)

1. The Headset's microphone audio enters the Mic Headset bus.
2. The Mic Headset bus jumps to the A2 bus - which is connected to the FT-991A transmit port
3. And the radio receives the audio to be transmitted.

Web browsing, computer music, etc. (blue stream)

1. The general Windows sounds from browsers, other programs etc enters the Audio Apps bus.
2. The Audio Apps bus is jumped to the A3 bus - which is connected to the laptop's built-in speakers
3. And the laptop speakers will only play the Windows or apps sounds, without playing any radio sound.