Sound samples used by Music Exercises Generator

The same list is published by the site and by the app. The site uses only
some of these samples; the app uses all of them.

piano-mp3/
  Salamander Grand Piano V3 (Yamaha C5) by Alexander Holm
  https://archive.org/details/SalamanderGrandPianoV3
  Licensed under Creative Commons Attribution 3.0 Unported
  https://creativecommons.org/licenses/by/3.0/
  Changes: one velocity layer (v8), retuned with the table by Markus Fiedler
  distributed with the instrument, notes between the sampled ones obtained by
  resampling the nearest sample, shortened to 3.5 s, mixed to mono, encoded as mp3.

bass/ and drums/
  Double bass (pizzicato), 21" ride cymbal and hi-hat from the
  University of Iowa Electronic Music Studios, Musical Instrument Samples
  https://theremin.music.uiowa.edu/MIS.html
  "may be downloaded and used for any projects, without restrictions"
  Changes: single notes cut from the recordings, normalised, encoded as mp3.

drums/brush-stir.mp3, drums/brush-tap.mp3
  Swirly Drums by Karoryfer Samples (snare played with brushes)
  https://github.com/sfzinstruments/karoryfer.swirly-drums
  Creative Commons CC0 public domain dedication
  https://creativecommons.org/publicdomain/zero/1.0/
  Changes: 3.2 s of one stir and one soft hit, faded at the ends,
  normalised, encoded as mp3.

drums/kick.mp3, drums/hihat-closed-soft.mp3, drums/sidestick.mp3
  Big Rusty Drums by Karoryfer Samples (24" kick, 14" hi-hat, 14" snare)
  https://github.com/sfzinstruments/karoryfer.big-rusty-drums
  Creative Commons CC0 public domain dedication
  https://creativecommons.org/publicdomain/zero/1.0/
  Changes: one hit per sound (kick, tightly closed hi-hat, snare side stick),
  close microphone mixed with the overheads, cut to its attack and decay,
  mixed to mono, normalised, encoded as mp3.

piano-export/
  Upright Piano KW (Kawai upright) by Gonzalo and roberto@zenvoid.org for the
  FreePats project
  https://github.com/freepats/upright-piano-kw
  Creative Commons CC0 public domain dedication
  https://creativecommons.org/publicdomain/zero/1.0/
  Used only for the MP3 files downloaded from the app, in place of piano-mp3/,
  so that the downloaded files carry no licence obligations.
  Changes: the soft velocity layer, one note every minor third, shortened to
  4 s, mixed to mono, normalised, encoded as mp3. Notes between the sampled
  ones are obtained by retuning the nearest sample.

Metronome and count-in click
  Not a sample: generated by the code (utils/clickSound.ts).

guitar/
  Spanish classical guitar by roberto@zenvoid.org for the FreePats project
  https://github.com/freepats/spanish-classical-guitar
  Creative Commons CC0 public domain dedication
  https://creativecommons.org/publicdomain/zero/1.0/
  Changes: notes from C2 up, shortened to 4 s, level lowered to match the
  piano, encoded as mp3. Notes between the sampled ones are obtained by
  retuning the nearest sample while playing.

ukulele/
  Ukulele (Flight Fireball, tenor) by Mateusz Dąbrowski for the FreePats project
  https://github.com/freepats/ukulele1
  Creative Commons CC0 public domain dedication
  https://creativecommons.org/publicdomain/zero/1.0/
  Changes: the 13 pitched samples, resampled to 44.1 kHz, level raised to
  match the piano, encoded as mp3. Notes between the sampled ones are
  obtained by retuning the nearest sample while playing.