EXFO FTB-2 - Manual (Page 78)

Setting Up Your FTB-2 and FTB-2 Pro
68 FTB-2 and FTB-2 Pro
Adjusting Microphone and Speaker Volume
To adjust speaker (or headphones) volume:
1. From the right side of the screen, swipe left to display the Charm bar.
2. Tap Settings, and then the icon.
3. Move the slider until the sound level is to your liking.
Note: You can also access the sound level slider by tapping the icon from the
taskbar.
The new value is taken into account immediately.