You will go to font 1 when you insert the battery and power up. To go to different fonts with one switch, insert the battery/remove kill plug if you have one, gently twist/rotate the saber twice. The saber will announce the current font on the first twist and, on the second twist, it will go to the next font. Repeat twisting until you hear the font you want then power it on.
NOTE: Ensure you select "single button/one button" option in the config editor and save it to your card according to the manual. This should enable the twist function.
As far as the threshold acronyms are concerned, when on the specific setting in the config editor, there is an explanation of it in the lower right corner of the window. Clicking or tabbing to the other thresholds will, of course, display different explanations in the box.
To increase the volume and sensitivity, ensure the saber is off. Hold the button for two or more seconds. This will take you to the "onboard menu" with a voice that tells you what setting you are on. Press the button to change the value/hold the button to move to the next setting.
There is a lot of information in the manual. You can download it from
Naigon's website. Link is down the right side of the web page.
Hope this helps.