A lot depends on what other features/parameters you have that you want to expose via RDM.
If it is just a basic dimmer pack with the main setting being a DMX address and the DMX addresses are contiguous for all the dimmers in the pack, then I would probably opt to chose handling it as a root device that uses 4 slots and not go the sub-device route.
If on the other hand you've got a larger rack that can have different types of dimmer modules with different settings/parameters such as module type, dimmer curve, current load, etc.. then sub-devices are the route to go.
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Scott M. Blair
RDM Protocol Forums Admin
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