Modder Converts Steam Controller Haptics Into Stereo Speakers

A Very Unexpected Use for Those Trackpads

The Steam Controller never quite found the mainstream audience Valve hoped for when it launched back in 2015, but its community of dedicated fans has kept finding new reasons to love the thing. The latest reason is genuinely strange and kind of wonderful: a modder has built a custom HID tool that turns the controller’s dual trackpad haptic actuators into a pair of stereo speakers.

As reported by Tom’s Hardware, the mod transmits 16-bit audio to the Steam Controller over a wired connection, with the haptics on each trackpad handling a separate channel. The result, according to the report, sounds “surprisingly full” for what is essentially two vibration motors being pressed into an entirely unintended role.

What Is Actually Happening Here

The Steam Controller’s trackpads use haptic feedback mechanisms rather than traditional rumble motors. That design choice was all about giving players fine-grained tactile response for precise cursor control, and Valve put real engineering effort into those actuators. Turns out that same physical precision that makes them good at simulating texture and resistance also makes them capable of moving enough air to produce recognizable audio.

The custom HID tool the modder built is what makes this possible. HID, or Human Interface Device, is the protocol standard that covers how peripherals like controllers and keyboards communicate with a host system. By writing a tool that speaks to the Steam Controller through that interface and feeds it raw audio data rather than haptic commands, the modder essentially reprogrammed what the controller thinks it is supposed to be doing with those actuators.

The wired connection is a necessary constraint here, not a limitation the modder chose arbitrarily. Pushing 16-bit audio over Bluetooth at a usable sample rate would be a much harder problem, and the wired USB path gives the tool the bandwidth it needs to keep the audio coherent.

The Steam Controller’s Unlikely Afterlife

Valve discontinued the Steam Controller in 2019, clearing remaining inventory at a steep discount that briefly crashed its own servers when fans rushed to stock up. The hardware never died in the community, though. Modders and enthusiasts have continued poking at it for years, partly because the trackpad-heavy design remains genuinely unique among PC controllers, and partly because the kind of person who bought a Steam Controller in the first place tends to be exactly the kind of person who wants to do something weird with their hardware.

This particular mod sits in a long tradition of finding audio output in unlikely places. People have coaxed music out of floppy drives, hard disk read heads, and dot matrix printers by carefully controlling their mechanical movements. Haptic actuators are a more modern version of the same underlying trick: any mechanism that moves with enough speed and consistency can approximate sound waves, even if that was never the point.

The 16-bit audio spec the modder landed on is worth noting. That is CD-quality bit depth, the same standard that has been the baseline for consumer audio since the 1980s. Getting that out of trackpad haptics, over USB, in stereo, is a result that would have seemed implausible before someone actually went and did it.

No word yet on whether anyone has tried playing music through it while also using it as a controller. That seems like the obvious next question.