Chord is also called polyphony, which refers to the sum of the number of sounds of each channel in MIDI. It is a different concept from the chord in music theory. Polyphonic ringtones are richer in tone than previous single tone ringtones and have a strong three-dimensional feel. The number of chords on a mobile phone is equal to the number of audio tracks in the midi format, but each audio track on the mobile phone is a monophonic track. This is the biggest difference from the midi we often listen to on computers, and it is also the impact of the number of chords on the ringtone effect. The origin of. At present, the ringtones of mobile phones sold in the domestic market can be roughly divided into monosyllable ringtones, 3-chord ringtones, 4-chord ringtones, 16-chord ringtones, 32-chord ringtones, 40-chord ringtones, and 64-chord ringtones. There is a big difference between the sound of single tone and chord tone; the sound of 4 chord ringtones and 16 chords are too simple, and the difference is relatively big. The difference between the ringtones of 40 chords and 32 chords is not big, while the difference between the ringtones of 64 chords and 40 chords is very big. Big. In short, 3 chords and 4 chords are on the same level, 16 chords are on the same level, 32 chords and 40 chords are on the same level, and 64 chords are on the same level.