自由唱一段 melody（不用 metronome、不用對齊和弦）。錄完按 Analyze：偵測 F0、切成 note grid 給你看。下一步會把 note grid 餵進 generator 反推和弦，再用你自己的聲音 pitch-shift 出其他聲部。Sing any monophonic melody — no click, no grid. Hit Analyze to extract pitch and segment it into notes; next milestone hands those notes to the generator for chord inference and self-harmonization.