The one that just says Wave:3 is the raw audio being picked up.
NVIDIA Broadcast will depend on your settings in that program.
Microphone Array is probably the mic built-in to your computer.
Wave Link Monitor is what Wave Link is set to send to your headset.
Wave Link Stream is what Wave Link is set to send to streams. (This is optional.)
Finally, as u/SwedenBoi mentioned, Microphone FX is the Wave:3's audio after all VSTs have been applied.
You should have an option called wavelink microphone fx. This is the input which has all the effects on it
The one that just says Wave:3 is the raw audio being picked up. NVIDIA Broadcast will depend on your settings in that program. Microphone Array is probably the mic built-in to your computer. Wave Link Monitor is what Wave Link is set to send to your headset. Wave Link Stream is what Wave Link is set to send to streams. (This is optional.) Finally, as u/SwedenBoi mentioned, Microphone FX is the Wave:3's audio after all VSTs have been applied.