Trace group actions:
read: r
write: w
deletechannel: dc <group_index>
select: sel <group_index>
clone: clo
readpredictedphases: rpp file <fileURL> format <format_type>
funcgen: fgen IMPULSE <index_center> | SINE <freq Hz> <phase deg> [delta <dt>] [npts <num_samples>]
generates a function in a new trace-group