Stereo keyboard sounds, key by key

Updated October 25, 2026

On a real keyboard, the keys on the left are nearer your left ear than the keys on the right. Teclo imitates that by playing each key a little to its side: Esc and Tab lean left, Return and Delete lean right, and Space stays in the middle.

Why it matters

People notice when it is missing. One listener wrote in the r/apple thread where Klack launched: “What takes me out of the illusion is when I press Enter/Return … I still hear the sound at the center instead of the right.” Another asked a newer app’s maker to “try mapping key position to stereo pan based on physical keycap location rather than just L/R halves”. The open-source Bucklespring, which samples a buckling-spring board, plays each key “simulating the proper distance and direction”.

How Teclo places each key

Teclo carries a map of where every key sits across a standard ANSI keyboard, 15 key-widths from the left edge to the right. For each press and release it turns that place into a pan between −0.35 (left) and +0.35 (right). The ear nearer the key hears the sound at full level; the far ear hears it a little quieter.

The figures are computed from Teclo’s key map and its pan rule (PlaybackVariation.swift), not measured at the ear. Space, the number pad and keys with no sound get no side at all.

Why only 0.35 and not all the way? A real board is not wide enough to put a key in one ear only, so Teclo keeps the pan partial: the far side never drops more than 3.7 dB, and the keyboard stays in front of you, slightly spread.

Each press also gets a small random change in level and pitch on top of its place; how keyboard sound apps work has those figures.

Headphones or speakers

Stereo by key position is clearest in headphones, where each ear gets only its own channel. A MacBook’s built-in speakers sit close together, so the spread is narrower; external speakers set apart on the desk sit in between. The packs you can play on this site are not panned; the Mac app is.

Stereo, spatial audio and the other apps

The table above lists what each app’s own page says. “Spatial audio” on Klack and Tacque is a broader claim than stereo pan; we have not tested how either works. If stereo matters to you, try two apps in your own headphones before you buy. Teclo’s 1-day trial needs no account, and the guide to keyboard sound apps for Mac covers the rest of each app.