Known algorithm shortcomings

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General shortcomings

  • Rhythm is only assessed properly if the notes change. Mistakes in rhythm are very often not reported if the note played does not change.
    • If creating rhythm exercises, we recommend having the student alternate between two notes instead of playing it on a single note

Singing

  • Consonants like "S", "F" and "T" produce non-pitched areas that look like noise/silence to our algorithm and cause small yellow spots at the beginning of those syllables on the feedback line
    • This is only a problem with synthesized MIDI reference files, as they do not take account of lyrics
    • We recommend using real audio reference files, or asking students to sing all notes on just "A" or "O" instead of "do-re-mi" syllables

Percussion instruments

  • There is NO SUPPORT WHAT SO EVER FOR DRUMS, i.e. non-pitched percussion instruments
  • Glockenspiel is also known to be very problematic, even if real audio is used as reference
  • Xylophone and Marimba should work, assuming the student also plays the same instrument