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# Sequencer |
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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)! |
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!> **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. |
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## Enable the step sequencer |
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Add the following line to your `rules.mk`: |
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```make |
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SEQUENCER_ENABLE = yes |
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``` |
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By default the sequencer has 16 steps, but you can override this setting in your `config.h`: |
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```c |
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#define SEQUENCER_STEPS 32 |
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``` |
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## Tracks |
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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! |
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## Resolutions |
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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). |
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|Resolution |Description | |
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|---------- |----------- | |
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|`SQ_RES_2` |Every other beat | |
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|`SQ_RES_2T` |Every 1.5 beats | |
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|`SQ_RES_4` |Every beat | |
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|`SQ_RES_4T` |Three times per 2 beats| |
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|`SQ_RES_8` |Twice per beat | |
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|`SQ_RES_8T` |Three times per beat | |
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|`SQ_RES_16` |Four times per beat | |
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|`SQ_RES_16T` |Six times per beat | |
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|`SQ_RES_32` |Eight times per beat | |
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## Keycodes |
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|Keycode |Description | |
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|------- |----------- | |
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|`SQ_ON` |Start the step sequencer | |
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|`SQ_OFF` |Stop the step sequencer | |
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|`SQ_TOG` |Toggle the step sequencer playback | |
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|`SQ_SALL`|Enable all the steps | |
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|`SQ_SCLR`|Disable all the steps | |
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|`SQ_S(n)`|Toggle the step `n` | |
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|`SQ_TMPD`|Decrease the tempo | |
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|`SQ_TMPU`|Increase the tempo | |
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|`SQ_R(n)`|Set the resolution to n | |
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|`SQ_RESD`|Change to the slower resolution | |
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|`SQ_RESU`|Change to the faster resolution | |
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|`SQ_T(n)`|Set `n` as the only active track or deactivate all | |
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## Functions |
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|Function |Description | |
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|-------- |----------- | |
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|`bool is_sequencer_on(void);` |Return whether the sequencer is playing | |
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|`void sequencer_toggle(void);` |Toggle the step sequencer playback | |
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|`void sequencer_on(void);` |Start the step sequencer | |
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|`void sequencer_off(void);` |Stop the step sequencer | |
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|`bool is_sequencer_step_on(uint8_t step);` |Return whether the step is currently enabled | |
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|`void sequencer_set_step(uint8_t step, bool value);` |Enable or disable the step | |
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|`void sequencer_set_step_on();` |Enable the step | |
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|`void sequencer_set_step_off();` |Disable the step | |
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|`void sequencer_toggle_step(uint8_t step);` |Toggle the step | |
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|`void sequencer_set_all_steps(bool value);` |Enable or disable all the steps | |
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|`void sequencer_set_all_steps_on();` |Enable all the steps | |
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|`void sequencer_set_all_steps_off();` |Disable all the steps | |
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|`uint8_t sequencer_get_tempo(void);` |Return the current tempo | |
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|`void sequencer_set_tempo(uint8_t tempo);` |Set the tempo to `tempo` (between 1 and 255) | |
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|`void sequencer_increase_tempo(void);` |Increase the tempo | |
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|`void sequencer_decrease_tempo(void);` |Decrease the tempo | |
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|`sequencer_resolution_t sequencer_get_resolution(void);` |Return the current resolution | |
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|`void sequencer_set_resolution(sequencer_resolution_t resolution);` |Set the resolution to `resolution` | |
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|`void sequencer_increase_resolution(void);` |Change to the faster resolution | |
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|`void sequencer_decrease_resolution(void);` |Change to the slower resolution | |
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|`bool is_sequencer_track_active(uint8_t track);` |Return whether the track is active | |
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|`void sequencer_set_track_activation(uint8_t track, bool value);` |Activate or deactivate the `track` | |
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|`void sequencer_toggle_track_activation(uint8_t track);` |Toggle the `track` | |
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|`void sequencer_activate_track(uint8_t track);` |Activate the `track` | |
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|`void sequencer_deactivate_track(uint8_t track);` |Deactivate the `track` | |
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|`void sequencer_toggle_single_active_track(uint8_t track);` |Set `track` as the only active track or deactivate all | |
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