Musical Details
Playback keys
4chord MIDI provides playback in any chosen key. At this point, the pitch is however hard coded. The long-term goal is to make this user-definable, but at this point the following chords are used with each key:
| Key | I | V | vi | IV |
|---|---|---|---|---|
| C | C3 | G2 | A2 | F2 |
| C# | C#3 | G#2 | Bb2 | F#2 |
| D | D3 | A2 | B2 | G2 |
| D# | D#3 | Bb2 | C3 | G#2 |
| E | E3 | B2 | C#3 | A2 |
| F | F3 | C3 | D3 | Bb2 |
| F# | F#3 | C#3 | D#3 | B2 |
| G | G2 | D3 | E3 | C3 |
| G# | G#2 | D#3 | F3 | C#3 |
| A | A2 | E3 | F#3 | D3 |
| Bb | Bb2 | F2 | G2 | D#2 |
| B | B2 | F#2 | G#2 | E2 |
Playback tempo
The playback tempo can be selected in single steps from 30bpm to 240bpm. Future plans will include a list of pre-defined playback tempos.
Playback tempo affects all the arpeggio playback modes. Currently playback is only in 4/4 bar with quarter notes only.
Playback modes
There are currently five playback modes implemented. This will also be extended at some point and offer more flexible, user definable modes.
| Mode | first | second | third | fourth |
|---|---|---|---|---|
| 1 | - | - | - | - |
| 2 | 1-3-5 triad | third | fifth | third |
| 3 | 1-3-5 triad | third | fifth | octave |
| 4 | root | third | fifth | third |
| 5 | root | third | fifth | octave |
Depending on the chord, the third is naturally either the major (I, V, IV) or the minor (vi) third.