Patching Scrollers

I use the generic "scroller dimmer" fixture for my Morpheus color rangers. I can patch these fixtures to a dmx address that represents the dimmer channel of the fixture the scroller is mounted on. When I try to do this, the dmx address that gets assigned is just the next available number. Is there a way that I can change the dmx address so that it actually matches that of my dimmer channel. My dimmers are addressed in groups of 4. I don't have the ability to assign them dynamically.

Any help would be greatly appreciated.

Ross
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