Why is my microphone volume low in my streams or recordings?
Volume levels may vary depending on the microphone used and the recording environment.
To accommodate this, you can increase the volume range for both your System Sound and Microphone up to 300% by going to Tools > Settings and clicking the Audio tab.
The boosted volume levels will be shown in blue on your stage audio controls. You can right-click on any of the volume bars to automatically reset them to 100%.