Emitters Emitters

An emitter can be placed on a cell on the touchgrid, from where it will start emitting a stream of grains. All placed emitters are activated per each voice. Each emitter can be one of four color-coded configurations.

Tempera will only make sound when there is an emitter placed and a voice is played.

Turning the corresponding knob tweaks the volume of the emitter and each display corresponds to one emitter:

  • Edit the emitter configuration

  • Select the emitter for placing

Holding the Round button reveals alternate context:

  • Clear all placed emitters

  • Pause / Unpause emitter grain generation

Emitters have many parameters that determine their behavior in time an space. Some parameters can be modulated, and some can be added an optional Jitter.

  • Grain size is how long each grain is, measured in grid cells

  • Grain time changes the grain length to a note duration in time signature

  • Grain density determines how many grains are generated. A density of 1 means that there will be one grain played shoulder to shoulder.

  • Quantize determines how much are grains emitted based on size-density, or based on Note

  • Note sets the time signature at which new grains are emitted

  • Spray X and Y sets amount of randomness in grain spawning horizontally (across tracks) and vertically (along a track)

  • Align makes the emitted grain always start at the beginning of a cell. When not set, grains can be emitted from positions in between.
    Setting this on is be useful for percussion tracks, where there’s likely a transient at beginning of each cell

  • Fade in and out of emitted grains after the emitter is placed or removed

  • Grain fade is the amplitude envelope of each grain. Low value makes sharp transient grains, high value makes each grain have a smooth fade in and fade out

  • Tone will apply a gentle low-pass and/or high-pass filter pair. This is essentially a variable-width band-pass filter.

  • Grain pan (either in L/R or M/S)

  • Tune spread to give each grain a random tuning variation, in range of ±1 octave. Apply very gently for a thickening detune.

  • Octave transposition of generated grains

  • Channel sets the MIDI channel at which the emitter is responsive

  • Name of the emitter

  • Placement changes the touchgrid behavior

    • Instant: touch to place, release to remove

    • Toggle: touch to toggle

    • Latch: once all fingers are removed, all emitters are cleared at next placement

    • Lock the placed emitter to prevent it from being replaced by another

    • When 2-lane is on, the emitter gains exclusive access to the pair of tracks below it. For example, when activated for the blue emitter, anytime an emitter is placed on the first two tracks, it will be blue regardless of which emitter is selected.


  • Set Grain density to below 1 and try playing with super short Grain size.

  • Press the Emitters Emitters button twice to edit the last edited emitter.

  • Once a grain is generated and already in flight, it will stop either when it runs its course, or if the voice playing it is released.

Frequently Asked Questions

  • How can I scrub through a sample smoothly?

    It is possible to modulate an emitter’s Rel X and Rel Y (short for relative) positions with a modulator or MIDI input. Emitting short grains is recommended for smooth scrubbing. With longer grains it is possible to do grain sequencing.

  • Can effects be applied to each emitter separately?

    As of firmware v1.5 this isn’t possible.

  • My high-density short grain emitter sounds very metallic, as if glitched. Why?

    When a lot of grains are emitted from exactly the same position periodically, for example 100 times per second, this will create an audible frequency component of 100Hz. Add a tiny amount of Spray Y and grain trigger will no longer be harmonic.