La table siguiente define algunos mensajes que son legales para MENSAJEMIDI.
| Nombre de Comando (en inglés) | Byte de Estato | Byte de Datos 1 | Byte de Datos 2 |
|---|---|---|---|
| Note Off | 128 + Canal | 0-127 Tono | 0-127 Velocidad |
| Note On | 144 + Canal | 0-127 Tono | 0-127 Velocidad |
| Poly Pressure | 160 + Canal | 0-127 Tono | 0-127 Presión |
| Control Change | 176 + Canal | 0 indefinido | 0-127 MSB |
| Control Change | 176 + Canal | 1 Modulation Wheel | 0-127 MSB |
| Control Change | 176 + Canal | 2 Breath Controller | 0-127 MSB |
| Control Change | 176 + Canal | 3 After Touch | 0-127 MSB |
| Control Change | 176 + Canal | 4 Foot Controller | 0-127 MSB |
| Control Change | 176 + Canal | 5 Portamento Time | 0-127 MSB |
| Control Change | 176 + Canal | 6 Data Entry | 0-127 MSB |
| Control Change | 176 + Canal | 7 Main Volume | 0-127 MSB |
| Control Change | 176 + Canal | 8-31 indefinido | 0-127 MSB |
| Control Change | 176 + Canal | 32-63 LSB de 0-31 | 0-127 MSB |
| Control Change | 176 + Canal | 64 Damper Pedal | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 65 Portamento | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 66 Sostenuto | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 67 Soft Pedal | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 68-92 indefinido | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 93 Chorus | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 94 Celeste | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 95 Phaser | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 96 Data Entry + 1 | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 97 Data Entry - 1 | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 98-121 Undefined | 0:apagado 127:encendido |
| Control Change | 176 + Canal | 122 Local Control | 0-127 |
| Control Change | 176 + Canal | 123 All Notes Off | 0 |
| Control Change | 176 + Canal | 124 Omni Mode off | 0-15 |
| Control Change | 176 + Canal | 125 Omni Mode on | 0 |
| Control Change | 176 + Canal | 126 Mono on/Poly off | 0 |
| Control Change | 176 + Canal | 127 Poly on/Mono off | 0 |
| Program Change | 192 + Canal | 0-127 Programa | No usado |
| Channel Pressure | 208 + Canal | 0-127 Presión | No usado |
| Pitch Wheel | 224 + Canal | 0-127 LSB | 0-127 MSB |
| System Exclusive | 240 | 0-127 Código ID | Cualquier número de bytes |
| Undefined | 241 | No usado | No usado |
| Song Position | 242 | 0-127 LSB | 0-127 MSB |
| Song Select | 243 | 0-127 Canción | No usado |
| Undefined | 244 | No usado | No usado |
| Undefined | 245 | No usado | No usado |
| Tune Request | 246 | No usado | No usado |
| End of Exclusive | 247 | No usado | No usado |
| Timing Clock | 248 | No usado | No usado |
| Undefined | 249 | No usado | No usado |
| Start | 250 | No usado | No usado |
| Continue | 251 | No usado | No usado |
| Stop | 252 | No usado | No usado |
| Undefined | 253 | No usado | No usado |
| Active Sensing | 254 | No usado | No usado |
| System Reset | 255 | No usado | No usado |