Barry Wu

This release adds Display Control on macOS 15 or later. You can select multiple displays and adjust their brightness together or individually using the brightness keys, custom shortcuts, or scrolling.
External displays can follow the built-in display while keeping their own brightness offset, and presets can now remember display selection and brightness alongside your audio setup. With Tutti Remote 1.1.0, you can also control individual displays or the whole group from your iPhone.
On the audio side, Stereo Mode has been improved on macOS 14.4+: assigned left and right speakers keep their roles, while any additional selected outputs play full stereo instead of going silent.
Full release notes:
https://github.com/BarryBarrywu/...
If you try it with a particular display and speaker setup, I d be glad to hear how it works for you.

I built Tutti because macOS still only lets you play audio through one output at a time, and I was tired of picking between my desk speakers and my MacBook. The idea was simple tick a few outputs, hear the same thing everywhere. Building it was less simple, and two problems in particular ended up reshaping the whole app.

The first was sync. The moment I sent audio to more than one device, they drifted apart. My MacBook were basically instant, but a Bluetooth speaker lagged just enough to sound like a faint echo across the room. Slowing everything down to match the laggiest device felt wrong. So instead I added per-device latency tuning you nudge each output forward or back a few milliseconds until they all land together. Once it's dialed in, the whole room sounds like a single speaker.

The second one I didn't see coming: stereo. In headphones, left and right are obvious the mix is made for two ears sitting right next to each other. But send that same track to two speakers across the room and each one just plays the full mix. The stereo image collapses into a kind of mono mush. So I added stereo L/R split: one speaker plays the left channel, the other plays the right. Two cheap speakers placed a few feet apart suddenly give you an actual soundstage.

Neither of these was on my original list. They came from just living with the thing and noticing what felt off.