TriMixxx is an all-in-one DJ player, open at every layer: custom PCBs, an ESP32-S3 controller, a Raspberry Pi running a Mixxx fork, and a Pro DJ Link stack that plays with real CDJs. Not a product: a platform.https://trimixxx.e1n.sh/enhttps://trimixxx.e1n.sh/blog/trimixxx-1-0/https://trimixxx.e1n.sh/blog/trimixxx-1-0/The first release numbered like one. A History of everything played on the link, Record set, KEY SYNC with a list of keys, plain sticks shared with CDJs both ways, and two fixes the same day, one of them for a deck that offered its own operating system as a USB stick.Thu, 15 Oct 2026 00:00:00 GMTreleasesoftwarehttps://trimixxx.e1n.sh/blog/decks-that-dont-exist/https://trimixxx.e1n.sh/blog/decks-that-dont-exist/A whole TriMixxx deck running on a Mac from its real SD card, up in three seconds, beside emulated CDJ-2000NXS players booting Pioneer's own firmware. How a booth fits on a laptop, and what it changed about testing.Tue, 13 Oct 2026 00:00:00 GMTtoolingemulationtestinghttps://trimixxx.e1n.sh/blog/updates-that-roll-back/https://trimixxx.e1n.sh/blog/updates-that-roll-back/A deck in a booth can't be reflashed between two tracks. So TriMixxx releases go into a second slot on the card, start as a one-shot trial, and are kept only if the deck can still take the next one. Designed, built and fault-tested in two days.Fri, 09 Oct 2026 00:00:00 GMTsystemupdatesreliabilityhttps://trimixxx.e1n.sh/blog/a-night-at-technobase/https://trimixxx.e1n.sh/blog/a-night-at-technobase/On 4 October 2026 the second deck played its first gig, at Technobase, in a secret underground location. It read every stick it was given, froze on the big ones, and taught the next release what a deck in a booth really needs.Sun, 04 Oct 2026 00:00:00 GMTgigfield-testlessonshttps://trimixxx.e1n.sh/blog/two-decks/https://trimixxx.e1n.sh/blog/two-decks/A second chassis drawn around a 10.1-inch screen, a second deck built on 1 October, an eighth pad nobody expected, an accent colour each, a hotspot of its own, and a splash on screen twelve seconds sooner.Thu, 01 Oct 2026 00:00:00 GMThardwarechassisbring-uphttps://trimixxx.e1n.sh/blog/sends-and-returns/https://trimixxx.e1n.sh/blog/sends-and-returns/For a few weeks the deck doubled as an effects unit on an Allen & Heath Xone:92's aux send, returning wet signal only. It worked, it taught a lot about mixers and manuals, and in October it was taken out again.Fri, 14 Aug 2026 00:00:00 GMTaudioeffectsexperimenthttps://trimixxx.e1n.sh/blog/a-browser-for-a-thumb/https://trimixxx.e1n.sh/blog/a-browser-for-a-thumb/Mixxx's library is built for a mouse. The deck got a CDJ-style browser driven by one encoder, tracks that start playing before they have arrived, and its first tempo and phase sync with a live CDJ.Tue, 04 Aug 2026 00:00:00 GMTsoftwarebrowsersynchttps://trimixxx.e1n.sh/blog/the-deck-plays-doom/https://trimixxx.e1n.sh/blog/the-deck-plays-doom/Hold PLAY while the deck boots and it becomes a DOOM cabinet, the jog wheel turning and the pads picking weapons. Not a fork of the game, but a launch manager that reads the deck's own buttons at boot, and a virtual keyboard made of MIDI.Sat, 01 Aug 2026 00:00:00 GMTsoftwarelauncherdoomhttps://trimixxx.e1n.sh/blog/talking-to-cdjs/https://trimixxx.e1n.sh/blog/talking-to-cdjs/Two CDJ-2000NXS players, a Mac bridging their network, and one long evening of captures. By its end a real CDJ was browsing, loading and playing music served by TriMixxx. 51 findings, and a protocol nobody had implemented from the serving side.Fri, 31 Jul 2026 00:00:00 GMTpro-dj-linkreverse-engineeringnetworkhttps://trimixxx.e1n.sh/blog/mixxx-on-a-pi/https://trimixxx.e1n.sh/blog/mixxx-on-a-pi/A Raspberry Pi that boots into Mixxx, sees the deck as an ordinary MIDI controller, mounts DJ sticks read-only, and runs a fork with a skin made for a booth. And an audio buffer chosen against the measurement.Thu, 30 Jul 2026 00:00:00 GMTsoftwaremixxxraspberry-pihttps://trimixxx.e1n.sh/blog/a-deck-is-a-network/https://trimixxx.e1n.sh/blog/a-deck-is-a-network/Instead of one board that does everything, an ESP32-S3 in the middle and rings of tiny RISC-V boards for the pads, passing a single frame round at 500 kbaud. With white LEDs, a dying pin and a baud rate off by two along the way.Wed, 29 Jul 2026 00:00:00 GMThardwarefirmwareprotocolhttps://trimixxx.e1n.sh/blog/measure-twice/https://trimixxx.e1n.sh/blog/measure-twice/A real CDJ taken apart and measured photo by photo, a chassis drawn around it, a 3D printer, boards etched at home with a laser, and the first controller board of its own.Tue, 30 Jun 2026 00:00:00 GMThardwarechassispcbhttps://trimixxx.e1n.sh/blog/one-board-to-rule-them-all/https://trimixxx.e1n.sh/blog/one-board-to-rule-them-all/TriMixxx began as a single 250 mm board carrying a Compute Module 5, a DAC, USB-C power and a MIDI controller. It was fully routed, and never built.Thu, 26 Mar 2026 00:00:00 GMThardwarehistorykicad