The full name of the GM standard should be "General MIDI system Level 1". This standard was formulated in 1991. Based on the GS standard, it mainly stipulates timbre arrangement and simultaneous pronunciation. numbers and drum kit keys, and the important timbre editing and timbre selection parts in the GS standard have been removed. GM's timbre arrangement basically follows the GS standard, with only insignificant changes in the name, such as changing the name of GS's Piano 1 to Acoustic Grand Piano. Although the GM standard is not as powerful as the GS, it is the world's first universal MIDI instrument arrangement standard, and precisely because it simplifies the ROLAND GS standard, more MIDI equipment manufacturers can manufacture products that comply with this standard. MIDI device. Therefore, as soon as the GM standard was formulated, it received an enthusiastic response from MIDI manufacturers, especially multimedia equipment manufacturers. Since then, the equipment of major MIDI manufacturers have been marked with the GM standard. MIDI equipment has achieved deeper communication than ever before, preparing for the true arrival of the multimedia era. For today's MIDI equipment, the GM standard is the most basic.