There seems to be very little information available about HUB dimmers, however I have confirmed that dimmer model# M36 use 0 - (-24)V control.

Two possible resources for info on Hub Dimmers are:

ALM - 847-860-1490

Vara-Light /Dimatronics/ Hub  (815) 455-4400

Some installers have had success using our eDIN #1004 module as a replacement control interface for these dimmers.  The #1004 card should be set for maximum output (approx 16VDC) and the pots on the Hub dimmers should be trimmed to maximize that output.  Please note that while wiring the demultiplexer, polarity will need to be reversed at the dimmer cards.