Highstead 0.1.0

Highstead 0.1.0

The first public release of Highstead (CA-74), Idle Foundry's circuit model of the Oberheim SEM.

• Two oscillators with sync and PWM; LP/notch/HP and band-pass filtering; two envelopes and the native SEM LFO.
• MONO, POLY and UNISON; stereo voice placement; DRIVE with AUTO GAIN.
• 29 factory presets, MIDI Learn, MPE in Settings, and a standalone application.
• A focused SEM panel. NOTCH dims while BP is selected and restores its saved position when LP-HP returns.

Downloads

Platform	File
macOS 11+, Apple silicon and Intel	Highstead-0.1.0-macOS.pkg — signed and notarized
Windows 10/11 x86-64	Highstead-0.1.0-Windows-setup.exe
Windows, manual installation	Highstead-0.1.0-Windows-x86_64.zip
Linux x86-64, Ubuntu 22.04 or equivalent or later	Highstead-0.1.0-Linux-x86_64.tar.gz

Close your DAW, install, then restart/rescan it and choose Highstead by Idle Foundry. The installers include VST3, CLAP and the standalone; macOS also includes Audio Unit. On Linux, unpack and run ./install.sh. The Windows ZIP includes manual instructions. The Windows installer is unsigned and may trigger SmartScreen.

Checksums and corresponding source

Verify downloads with SHA256SUMS.txt. Highstead is GPL-3.0-or-later. The corresponding implementation source and documentation are in Highstead-0.1.0-source.tar.gz, built from commit 075cd6a650b0f8e03aa50fd6ea08814a8fde3279; the pinned Git dependency sources are in Highstead-0.1.0-git-sources.tar.gz. Third-party licenses are listed in THIRD-PARTY-NOTICES.txt.

The automatic “Source code” ZIP/tar links below belong to this downloads repository. Use the explicitly named Highstead source archives above for the instrument's source. The illustrated quick start is in docs/quick-start.md inside the implementation archive.

Feedback and current limits

Please report your OS, DAW/version, plug-in format, quality mode and reproduction steps. Oscillator aliasing residuals remain at extreme pitch/pulse settings; downstream behavior under extreme DRIVE/high-frequency input is still being characterized. This first version does not claim zero aliasing at every setting.