Four
A four-track recorder in the same brick as the K.O. II. The face follows a Portastudio: four channel faders, a master, a transport row, and a 3.2 inch screen where the cassette window was.
The tray is one FDM print. The face tiles lift off. Each of them fits the 153.36 × 77.76 mm plate.
- Height
- 240 mm
- Width
- 176 mm
- Thick
- 22 mm
Resin plate
The plate is 153.36 × 77.76 × 165 mm. Every resin part is kept inside 150.9 × 75.3, so there is 1.2 mm of clearance on each side. Height is not the limit. Lay the long side of a tile along the 153 mm axis. The wide fader tile is 70 × 143 mm. The screen tile, with the left ear attached, is 131 × 72 mm.
The tiles drop into a 2.2 mm rabbet in the tray. A drop of CA at the corners holds them. The seams are 0.5 mm, and a rib in the tray sits under each one. Tracks 1–2 share a tile, and so do tracks 3–4. Caps, keys, and the knob share one more plate.
- TrayFDM · 176 × 240STL
- faders 12Resin · 70 × 143STL
- faders 34Resin · 64 × 143STL
- masterResin · 36 × 143STL
- transport lResin · 80 × 19STL
- transport rResin · 90 × 19STL
- screenResin · 131 × 72STL
- ear rResin · 39 × 72STL
- Caps and keys, one plateResinSTL
- Fader cap ×4ResinSTL
- Master cap, orangeResinSTL
- FX knob, orangeResinSTL
- Transport key ×6ResinSTL
- Record button ×4ResinSTL
Pin holes match the rest of the row: 16, 25, 48, 216 and 224 mm from the fader end, 8 mm off the table, on both long sides.
Jacks
All 3.5 mm, cut in the FDM tray.
- Front: headphones, instrument, mic.
- Back: MIDI in, MIDI out, stereo line in, stereo line out, tracks 1 to 4.
Brain
A Daisy Seed. Its onboard codec is stereo, and this box needs four inputs and six outputs, so a PCM3168A sits beside it. Teensy 4.1 is the alternate if USB-host MIDI matters more than the audio library. A Bela Mini stays stereo, so it does not fit.
- MIDI clock is TRS, plus USB MIDI from the Seed.
- The screen is a 3.2 inch SPI panel, 320×240, with touch.
- FX is a send inside the mix. The orange knob above the master is that send.