Crepuscular Homunculus

Crepuscular Homunculus 0.26.19

A free, standalone synth and four-track groovebox for the M-VAVE FM-1, by TERKINSTEIN. Play, edit, sequence and save on the instrument itself.

Try the virtual FM-1 · Quick start · Full controls

Download

• Crepuscular-Homunculus-0.26.19.fwsc — the firmware to install.
• Crepuscular-Homunculus-0.26.19-source.zip — the complete matching source.
• SHA256SUMS.txt — checksums for verifying the attached files.

Licensing, credits and these release notes are also attached.

What's new since 0.22

• Crepuscular Homunculus naming, bubbling intro and reactive HOME artwork, with the creator splash and selectable Thorn Rift display retained.
• Native piano-roll editing and independent selected-track sound control.
• Saved song-wide swing: zero is straight; higher settings add a stronger lilt.
• Confirmation before a held HOME press can reset the song.
• Bounded display updates that keep page changes from blocking external MIDI clock service.
• More distinct SULFUR TONGUE and WICKED FELT sounds, with original definitions retained for older captures.
• Corrected USB/updater identity and the final 0.26.19 version label, without “dev.”

Before installing

Stop PLAY, release keys and pedals, let tails finish, press SAVE and wait for SAVED. Keep a separate song backup and your previous firmware. Follow the installation guide.

Supported older Homunculus songs migrate explicitly. Unrelated firmware's projects and samples do not. Returning to older firmware may require its own compatible backup; see save compatibility.

Validation and limits

The final label build passes the target build, host/AddressSanitizer checks, piano-roll navigation and save checks, and exact audio/save comparisons with 0.26.19-dev. The only native source difference from that build is the version string.

The retained 0.26.19-dev passed hardware identity, custom/official V15 switching and controlled transfer-recovery checks. Musical, USB audio and persistence results remain attributed to their tested builds. The suffix-free build was not flashed during release preparation. Read the validation record for exact scope.

Eight voices are shared, with at most four FM voices. No extra voices or new effects are added. Device timing excludes full USB/DAC/ISR load; exhaustive stack and power-loss recovery qualification is not claimed.

Firmware SHA-256: 985c1000dc58dd0afeafb18185a5de980795908166e9356d4c72fd07e656708f

GPL-3.0-only. Matching source and inherited credits are included.

Documentation in the attached source archive was refreshed after the original release tag. Source archive revision: 6a504c0. The firmware package is unchanged.