General MIDI 2
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General MIDI 2 (GM 2), also known as General MIDI Level 2, is a standard that expands upon the original General MIDI (Level 1) standard.
The features it adds largely stem from the Roland GS and Yamaha XG standards, such as CCs 71 through 78 to control various aspects of a sound's tonal quality, CC#91 and #93 to control the chorus and reverb, which are now required to be compliant, a new RPN MSB value defined (05 to set modulation range, similar to pitchbend range via 00), as well as a complement of controls from CC#120 to #127 to control how the device responds to MIDI messages, cutting off sounds, etc.
It implements a further 128 tones to the standard, accessible by switching the banks. It also defines several new drum kits from the Roland GS standard, like Power, Room, Electronic, Analog, Jazz, Brush, Orchestra and SFX sets, for a total of 8.
(To do: list of all the patches, plus the new tones)
(To do: list of all the available CC's, RPN's and SysEX messages)