RIDGID ATHEOS User Manual page 26

Also, each target has minimum and maximum range controls:
This is useful if for example one pattern should modulate two effects but you
don't want the full range of modulation for e.g. the second effect (maybe a filter
cutoff). Use these range controls to adapt the modulation to your liking.
You can also modulate the range controls of target slot #4 in each sequencer:
In the above picture, the maximum (high) range of target slot #4 of sequencer a
has been set to be modulated by sequencer c.
This is best explained by an example.
Let's say you modulate the filter cutoff in sequencer a with a repetitive pattern.
Using the sequencer range modulation, you can set up a long sweep in
sequencer c that will then automatically modulate the maximum range of
sequencer a.
The result is kind of opening a filter cutoff slowly but still with some modulation
going on. The cutoff changes would then be more and more audible over time.