Are the crossover frequencies and limiting threshold in the multiband limiter user adjustable?
The cross-over frequency and thresholds are user adjustable. But adjusting the X-overs in the limiter will also adjust the X-over in the expander and compressor in the same way as the cross-overs are shared. You can set an overal threshold, but with the band buttons you can adjust the individual bands.
Please refer to the user manual for further details.