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feature_sequencer.md

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Sequencer

Since QMK has experimental support for MIDI, you can now turn your keyboard into a step sequencer!

!> 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:

SEQUENCER_ENABLE = yes

By default the sequencer has 16 steps, but you can override this setting in your config.h:

#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