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MIDI input is more precise than microphone. For audio mode, tweak detection in Advanced settings if it feels off.
Microphone placement matters. Put your device 30–50 cm from the instrument, pointing at the soundhole on guitar or just above the strings on piano. Quiet room helps; avoid having the device on a vibrating surface.
If a chord isn't being detected in microphone mode, try playing it one octave higher or lower — the detection can be picky at the extremes of the pitch range.
Instead of pure random chords, try Chord progressions mode — it walks you through real progressions used in jazz and pop standards. Feel free to add your own