EXFO FTB-2 - Manual (Page 77)

Setting Up Your FTB-2 and FTB-2 Pro
FTB-2 and FTB-2 Pro 67
Adjusting Microphone and Speaker Volume
8. From the Levels tab, move the sliders until the settings are to your
liking. If the sound coming from your microphone is too low, you may
want to adjust the boost level as well.
9. Tap OK to confirm your new settings and close the window.
10. Tap OK to close the window and return to Control Panel.