https://github.com/algesten/sekvens
https://github.com/algesten/sekvens
Last synced: about 1 month ago
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- Host: GitHub
- URL: https://github.com/algesten/sekvens
- Owner: algesten
- Created: 2022-06-26T07:50:41.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-05-21T12:51:40.000Z (almost 2 years ago)
- Last Synced: 2025-01-25T08:26:59.008Z (3 months ago)
- Language: Rust
- Size: 70.3 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
sekvens
=======
# Functional requirements
## 4 tracks
Sekvens has 4 track outputs. Each track output consists of:
* A PITCH CV with volt per octave.
* A GATE signal.
* An LFO CV (also called "accent") output.
Each time the step of the sequencer changes, the outputs can change for each channel according to the settings of that step.
## Track lengths
The four tracks have individual lengths. Each track will play its full length and then loop from the beginning. The loop can either be synced to the RESET signal, or run free.
### 16 steps
The 16 steps are laid out with individual controls for each step. The step moves forward with each pulse of the inomcing SYNC signal.
### 8 parts
`G` is green diode. `R` is red diode. To access part 1-4, short push on the part button. To access the 5-8, hold down the part button for a little longer.
* `G---` Part 1
* `-G--` Part 2
* `--G-` Part 3
* `---G` Part 4
* `R---` Part 5
* `-R--` Part 6
* `--R-` Part 7
* `---R` Part 8
## Step input
* Rotary encoder with push button
* BiLED push button
Turning the rotary encoder sets the pitch of the step. The pitch adjusts in the quantization setting.
# TODO
## Global
## Track/part selectors
* [x] switch part - changes the 16 steps.
* [x] select - select which track the 16 steps show
* [x] mute - mute a track stops the gate (and pitch?)
* [x] copy/paste - copy step to other step, track to track, part to part, (bank to bank?)
### HOLD SHIFT
* [x] pattern root - root key for the scale
* [x] pattern scale
* [x] play/pause
* [ ] switch bank - switches all 8 parts.
* [x] play direction (forward, backward, random).
* [x] swing
* [x] length - length of the track 1-128 (track spanning multiple parts)
* [x] "loop mode" - restart track on each SYNC or loop free
* [x] base velocity - starting point for velocity or lfo offset.
* [x] velocity/lfo - switch mode between velocity or lfo for the track
* [x] base probability - base probabilty of each step triggering
* [x] Slew (glissando)
## Per step
* [x] step on/off (skip?)
* [x] note
* [x] legato
* [x] length
* [x] chord mode :)]
* [x] probability - (additive to step triggering, negative values possible)
* [x] Slew (glissando)
### HOLD VELOCITY
* [x] set velocity (and lfo?) - (additive to base velocity, negative values possible)
* [x] restart lfo (accent?!)
* [x] micro offset
* [ ] ratchet
## Chord mode
Press and hold step.
* [x] step root - root key for the scale
* [x] step scale
* [x] step pitch - same as pitch without chord mode
* [x] spread - how wide the chord is
## Reset mode
Hold shift + velocity
* [x] reset (bank) - blank everything in the current bank.
* [x] factory reset - blank all the things.
# Scales
```
[C] D [E] F [G] A [B] C [D] E [F] G [A] B C
root 3rd 5th 7th 9th 11th 13th
```
1. Select root node
2. Select scale
3. Sinfonion has modes to mean "collection of scales"
Inversions of Cm7
```
G
Eb Eb
C C C
Bb Bb Bb Bb
G G G
Eb Eb
C
root 1st 2nd 3rd
```
Sinfonion has a confusion of inversion + pitch (which becomes octave)
vs "free inversion", where the pitch just gradually climbs up/down.
I think there should be only one of these methods.
Spread
These are the spread configs of Sinfonion
```
1 3 5 7
1 * 5 7 * 3
1 * * 7 * 3 5
1 * 5 * * 3 * 7
1 * * 7 * * 5 * * 3
1 * * * * 3 * 7 * * 5
1 * 5 * * * * * * 3 * 7
1 * * 7 * * * * * * 5 * * 3
1 * * * * 3 * * * * * 7 * * 5
1 * * * * 3 * * * * 5 * * * * 7
```
# Pitch 1v/octave
Analyze Sinfonion.
Octave switch : -3 0 +3 octaves
Transpose : -12 0 +12 notes
Pitch + spread goes : 0v - 8.5v octaves roughly. With a 13th + some inversion
```
Volts Tone i8
-2.53 MIN ---
-2.5 F#-1 -30
-2 C0 -24
-1 C1 -12
0 C2 0
1 C3 12
2 C4 24
3 C5 36
4 C6 48
5 C7 60
6 C8 72
7 C9 84
8 C10 96
8.42 F10 101
8.47 MAX ---
```
Notice it's 11V total difference.