Yes, it should work. Use the same options for the 3rd track as you do with the 2nd.
The 2nd track should not create any mask, it should “respondâ€. Otherwise, it will clear the mask made by 1st track. Technically, this is sequential process, from top to bottom, with same logic for all tracks. Each event has an option on how to create/modify and respond to the mask. BEYOND has the same masking process as LD2000.