The Akai M-9 is a hardware sequencer and MIDI controller that was popular in the late 1980s and early 1990s. It allows users to input, manipulate, and playback sequences of notes and MIDI data for controlling various synthesizers and other MIDI-compatible devices. The M-9 features a powerful 16-track sequencer, real-time recording, quantization, and various other editing tools. It also includes 128 preset styles and a built-in drum machine for adding rhythm patterns to sequences. The Akai M-9 was a significant advancement in music production technology and continues to be a valuable tool for some musicians and studio engineers today.