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diff --git a/docs/feature_sequencer.md b/docs/feature_sequencer.md new file mode 100644 index 0000000000..8c8587a9b8 --- /dev/null +++ b/docs/feature_sequencer.md @@ -0,0 +1,88 @@ +# Sequencer + +Since QMK has experimental support for MIDI, you can now turn your keyboard into a [step sequencer](https://en.wikipedia.org/wiki/Music_sequencer#Step_sequencers)! + +!> **IMPORTANT:** This feature is highly experimental, it has only been tested on a Planck EZ so far. Also, the scope will be limited to support the drum machine use-case to start with. + +## Enable the step sequencer + +Add the following line to your `rules.mk`: + +```make +SEQUENCER_ENABLE = yes +``` + +By default the sequencer has 16 steps, but you can override this setting in your `config.h`: + +```c +#define SEQUENCER_STEPS 32 +``` + +## Tracks + +You can program up to 8 independent tracks with the step sequencer. Select the tracks you want to edit, enable or disable some steps, and start the sequence! + +## Resolutions + +While the tempo defines the absolute speed at which the sequencer goes through the steps, the resolution defines the granularity of these steps (from coarser to finer). + +|Resolution |Description | +|---------- |----------- | +|`SQ_RES_2` |Every other beat | +|`SQ_RES_2T` |Every 1.5 beats | +|`SQ_RES_4` |Every beat | +|`SQ_RES_4T` |Three times per 2 beats| +|`SQ_RES_8` |Twice per beat | +|`SQ_RES_8T` |Three times per beat | +|`SQ_RES_16` |Four times per beat | +|`SQ_RES_16T` |Six times per beat | +|`SQ_RES_32` |Eight times per beat | + +## Keycodes + +|Keycode |Description | +|------- |----------- | +|`SQ_ON` |Start the step sequencer | +|`SQ_OFF` |Stop the step sequencer | +|`SQ_TOG` |Toggle the step sequencer playback | +|`SQ_SALL`|Enable all the steps | +|`SQ_SCLR`|Disable all the steps | +|`SQ_S(n)`|Toggle the step `n` | +|`SQ_TMPD`|Decrease the tempo | +|`SQ_TMPU`|Increase the tempo | +|`SQ_R(n)`|Set the resolution to n | +|`SQ_RESD`|Change to the slower resolution | +|`SQ_RESU`|Change to the faster resolution | +|`SQ_T(n)`|Set `n` as the only active track or deactivate all | + +## Functions + +|Function |Description | +|-------- |----------- | +|`bool is_sequencer_on(void);` |Return whether the sequencer is playing | +|`void sequencer_toggle(void);` |Toggle the step sequencer playback | +|`void sequencer_on(void);` |Start the step sequencer | +|`void sequencer_off(void);` |Stop the step sequencer | +|`bool is_sequencer_step_on(uint8_t step);` |Return whether the step is currently enabled | +|`void sequencer_set_step(uint8_t step, bool value);` |Enable or disable the step | +|`void sequencer_set_step_on();` |Enable the step | +|`void sequencer_set_step_off();` |Disable the step | +|`void sequencer_toggle_step(uint8_t step);` |Toggle the step | +|`void sequencer_set_all_steps(bool value);` |Enable or disable all the steps | +|`void sequencer_set_all_steps_on();` |Enable all the steps | +|`void sequencer_set_all_steps_off();` |Disable all the steps | +|`uint8_t sequencer_get_tempo(void);` |Return the current tempo | +|`void sequencer_set_tempo(uint8_t tempo);` |Set the tempo to `tempo` (between 1 and 255) | +|`void sequencer_increase_tempo(void);` |Increase the tempo | +|`void sequencer_decrease_tempo(void);` |Decrease the tempo | +|`sequencer_resolution_t sequencer_get_resolution(void);` |Return the current resolution | +|`void sequencer_set_resolution(sequencer_resolution_t resolution);` |Set the resolution to `resolution` | +|`void sequencer_increase_resolution(void);` |Change to the faster resolution | +|`void sequencer_decrease_resolution(void);` |Change to the slower resolution | +|`bool is_sequencer_track_active(uint8_t track);` |Return whether the track is active | +|`void sequencer_set_track_activation(uint8_t track, bool value);` |Activate or deactivate the `track` | +|`void sequencer_toggle_track_activation(uint8_t track);` |Toggle the `track` | +|`void sequencer_activate_track(uint8_t track);` |Activate the `track` | +|`void sequencer_deactivate_track(uint8_t track);` |Deactivate the `track` | +|`void sequencer_toggle_single_active_track(uint8_t track);` |Set `track` as the only active track or deactivate all | + |