MIDI (Musical Instrument Digital Interface) is not audio data but a set of instructions that tell instruments what notes to play, at what velocity, and for how long.
Accuracy depends on the complexity of the audio. Single-instrument recordings with clear notes convert much better than full mixes.
Yes. MIDI files can be opened and edited in any DAW (Digital Audio Workstation) such as GarageBand, FL Studio, or Ableton Live.
Single-note monophonic recordings (one instrument playing one note at a time) convert most accurately. Piano or guitar solos work much better than full band recordings.
Drum tracks are difficult to convert accurately because they contain many simultaneous sounds. Dedicated drum-to-MIDI tools give better results for percussion.
Any DAW supports MIDI editing, including GarageBand (free on Mac), LMMS (free, cross-platform), FL Studio, Ableton Live, and Logic Pro.
Yes. MIDI files contain note data, not audio. You can assign any virtual instrument (VST) to play the notes in your DAW.