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Chimera 0.1.0

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@joegiralt joegiralt released this 14 Oct 19:27
v0.1.0
0fae78e

Chimera 0.1.0 (alpha)

New firmware for the PreenFM3: three sound engines, six parts, and the ORBIT sequencer. This is an early test version.

What to download

  • chimera-0.1.0.bin: the firmware.
  • factory-v1.zip: 56 sounds and 4 demo songs.

1. Install the firmware

Follow the short steps in the README.

2. Add the sounds

  1. Unzip factory-v1.zip.
  2. Turn the PreenFM3 off. Hold MENU and turn it on.
  3. Press button 3 (SD card access). The PreenFM3 shows up on your computer like a USB stick.
  4. Copy the CHIMERA folder onto it. If your computer asks, choose merge or replace.
  5. Eject it on your computer. Turn the PreenFM3 off and on again.

The demo songs replace any song saved in the first four slots.

To find the sounds: press EDIT + B1, then turn knob 2 to the FACTORY tab.

Demo songs

  • REVERB ROOMS: Turn TYPE through QUAD, ROOM and HALL.
  • REVERB BLOOM: Hold slow chords, then turn TYPE from BLOOM to REVERSE.
  • REVERB GATE: Play short, sharp notes: the gate cuts every tail, the echoes too.
  • CHORUS DELAY: Turn CHORUS through I, II and I+II.

Something wrong?

Built from f39e0d0e on 2026-10-14. Provided under the tester licence.

Third-party notices

Parts of the MODAL engine and one soft-clipper come from Mutable Instruments' Rings and stmlib:

Copyright 2012-2015 Emilie Gillet.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

The firmware also uses these open-source Rust crates, each under the licence shown (full texts: https://opensource.org/license/mit and https://www.apache.org/licenses/LICENSE-2.0):

  • arbitrary-int v2.2.0: MIT
  • az v1.2.1: MIT/Apache-2.0
  • bare-metal v0.2.5: MIT OR Apache-2.0
  • bare-metal v1.0.0: MIT OR Apache-2.0
  • bitfield v0.13.2: MIT OR Apache-2.0
  • bitflags v2.11.1: MIT OR Apache-2.0
  • byteorder v1.5.0: Unlicense OR MIT
  • cast v0.3.0: MIT OR Apache-2.0
  • cortex-m-rt v0.7.5: MIT OR Apache-2.0
  • cortex-m v0.7.7: MIT OR Apache-2.0
  • critical-section v1.2.0: MIT OR Apache-2.0
  • embedded-dma v0.2.0: MIT OR Apache-2.0
  • embedded-graphics-core v0.4.1: MIT OR Apache-2.0
  • embedded-graphics v0.8.2: MIT OR Apache-2.0
  • embedded-hal v0.2.7: MIT OR Apache-2.0
  • embedded-hal v1.0.0: MIT OR Apache-2.0
  • embedded-io v0.6.1: MIT OR Apache-2.0
  • embedded-io v0.7.1: MIT OR Apache-2.0
  • embedded-sdmmc-types v0.1.0: MIT OR Apache-2.0
  • embedded-sdmmc v0.10.0: MIT OR Apache-2.0
  • embedded-storage v0.3.1: MIT OR Apache-2.0
  • float-cmp v0.9.0: MIT
  • fugit v0.3.9: MIT OR Apache-2.0
  • gcd v2.3.0: MIT/Apache-2.0
  • hash32 v0.3.1: MIT OR Apache-2.0
  • heapless v0.8.0: MIT OR Apache-2.0
  • heapless v0.9.3: MIT OR Apache-2.0
  • hex-literal v1.1.0: MIT OR Apache-2.0
  • libm v0.2.16: MIT
  • micromath v2.1.0: Apache-2.0 OR MIT
  • nb v0.1.3: MIT OR Apache-2.0
  • nb v1.1.0: MIT OR Apache-2.0
  • num-traits v0.2.19: MIT OR Apache-2.0
  • portable-atomic v1.15.0: Apache-2.0 OR MIT
  • quote v1.0.45: MIT OR Apache-2.0
  • stable_deref_trait v1.2.1: MIT OR Apache-2.0
  • stm32h7 v0.15.1: MIT/Apache-2.0
  • stm32h7xx-hal v0.16.0: 0BSD
  • synopsys-usb-otg v0.4.0: MIT
  • syn v2.0.117: MIT OR Apache-2.0
  • syn v3.0.6: MIT OR Apache-2.0
  • thiserror v2.0.21: MIT OR Apache-2.0
  • u8g2-fonts v0.8.0: MIT OR Apache-2.0; its fonts are U8g2's, each under its own licence (https://github.com/olikraus/u8g2/blob/master/LICENSE)
  • unicode-ident v1.0.24: (MIT OR Apache-2.0) AND Unicode-3.0
  • usb-device v0.3.2: MIT
  • usbd-serial v0.2.2: MIT
  • vcell v0.1.3: MIT OR Apache-2.0
  • void v1.0.2: MIT
  • volatile-register v0.2.2: MIT OR Apache-2.0
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