Butter, a soft linear clack

Updated October 22, 2026

Linear, lubed, on gaskets and foam: a soft, rounded clack.

What it imitates

Butter models a linear switch, lubed, in a board mounted on gaskets with foam inside: the setup keyboard hobbyists build to take the rattle and ping out of a board. The result is a soft, rounded clack with little high end. It is the pack Teclo plays when you first open it.

Teclo’s sounds are synthesized, not recorded. Its sound engine builds each pack from a model of the parts that make the sound, then plays the same files in the app that you hear on this page.

How it measures

Every pack is measured when it is rendered. The table puts Butter next to Ivory and Boulder, the packs closest to it in feel.

Brightness is the energy-weighted mean frequency of a key press, so a higher number sounds brighter. Low/high is the energy below 1 kHz against the energy above it: the higher, the deeper. Nobody has tuned these packs by ear yet; the figures are what the files measure.

Who it suits

Long writing sessions where you want feedback without brightness, and anyone who finds the brighter packs tiring after an hour (a suggestion, not a measurement).

Use it in Teclo

1. Click the keycap icon in the menu bar to open Teclo’s window.
2. Pick Butter in the list of packs, under Mechanical.
3. Type anywhere. Teclo plays a different sound for a key going down and coming up, and separate sounds for Space, Return and Delete.

Every pack also has its own pair of mouse click sounds, made from the same model. Try the other packs on the sound packs page.