This section will go over all of the basic touch gestures 
that are available using the default settings. Please see 
the user manual for comprehensive explanations.  
Channel/Ref/Math Waveform Selection 
To select the active waveform, tap the desired channel, 
math or reference indicator. 
When selected, the icon will become a solid triangle. 
Vertical Position of Selected Waveform 
Swipe the screen vertically to set the vertical position 
of the selected waveform. 
Tapping the upper or lower part of the screen will also 
increase/decrease the vertical position.