Development of a version of MIDI for new products which is fully backward compatible is now under discussion in the MMA. First announced as "HD-MIDI" in 2005and tentatively called "HD Protocol" or "High-Definition Protocol" since 2008, this new standard would support modern high-speed transports and allow device discovery and enumeration, provide greater range and/or resolution in data values, increase the number of Channels and Controllers, support entirely new kinds of events, such as Direct Pitch in the Note message and a Note Update message, and at the same time decrease the complexity of messages. Various transports have been proposed for use for the HD-Protocol physical layer, including calls for Ethernet-based protocols such as IEEE AVB and ACN to be used as the sole or primary transport in show control environments. As of January 2012, a draft of the HD Protocol and an UDP-based transport is being reviewed by MMA's High-Definition Protocol Working Group (HDWG), which includes representatives from all sizes and types of companies; the final specification should be completed later in 2012.


Keith
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