The DTXM12 has a new firmware update that is available for free!
Here is the list of improvements:
1 - Added ability to route the CLICK ONLY ("ph2"=solo click) to the phones. In response to requests from professional drummers who do not want the M12 sounds mixed in with the click headphone feed.
2 - Added new PAD TYPES for our newest trigger pads including KU100 trigger pedal
3 - Expanded the GAIN setting range from between 0 and 64 to between 0 and 127.
Hope this helps,
DTX Product Specialist