The note names are written on the keys. Notes written in the two most common clefs (treble clef and bass clef) are connected to the piano. All notes can be written in an infinite number of ways. The most common enharmonic notes are included. A line going from a long red box means the notes go to the same key on the piano. Even though the drop-down keyboard on each block shows only one octave of notes, a number can be put in manually to get any note. To change octaves, simply add or subtract 12, or click on the arrows at the top of the keyboard.
There are 131 notes on Scratch's keyboard, numbered from 0 (C-1, about 8.18 Hz) to 130 (B♭9, about 14917.24 Hz). Each note is 1 number larger than the previous, and the ratio of frequency is always (approximately 1.06), with A4 being exactly 440 Hz.
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| Note | Note number | Frequency |
|---|---|---|
| C3 | 48 | 131 Hz |
| C♯3/D♭3 | 49 | 139 Hz |
| D3 | 50 | 147 Hz |
| D♯3/E♭3 | 51 | 156 Hz |
| E3 | 52 | 165 Hz |
| F3 | 53 | 175 Hz |
| F♯3/G♭3 | 54 | 185 Hz |
| G3 | 55 | 196 Hz |
| G♯3/A♭3 | 56 | 208 Hz |
| A3 | 57 | 220 Hz |
| A♯3/B♭3 | 58 | 233 Hz |
| B3 | 59 | 247 Hz |
| C4 (middle C) | 60 | 262 Hz |
| C♯4/D♭4 | 61 | 277 Hz |
| D4 | 62 | 294 Hz |
| D♯4/E♭4 | 63 | 311 Hz |
| E4 | 64 | 330 Hz |
| F4 | 65 | 349 Hz |
| F♯4/G♭4 | 66 | 370 Hz |
| G4 | 67 | 392 Hz |
| G♯4/A♭4 | 68 | 415 Hz |
| A4 | 69 | 440 Hz |
| A♯4/B♭4 | 70 | 466 Hz |
| B4 | 71 | 494 Hz |
| C5 | 72 | 523 Hz |
