OB-Xf
Key Features
- Oberheim OB-X-inspired virtual analog synth based on the last open-source OB-Xd lineage
- Stable v1.0.3 release with installers for Windows, macOS, and Linux
- Expanded filter section including a 4-pole mode and Oberheim Xpander-style filter options
- Additional per-voice modulation with a second LFO and waveform morph controls
- Ring modulator, multimode noise color, and inverted filter envelope mode for broader sound design
- Modern Surge Synth Team project infrastructure with official manual, changelog, GitHub source, and nightly builds
Description
OB-Xf by Surge Synth Team is an Oberheim OB-X-inspired virtual analog synth and a continuation of the last open-source OB-Xd codebase. It keeps the familiar two-oscillator vintage polysynth direction while moving the project into the Surge team's modern build, documentation, and release infrastructure.
The instrument is built for classic broad pads, brassy stabs, basses, and animated analog-style leads rather than wavetable or sample-based sound design. The source project has moved beyond the early beta coverage, with the official page now offering a stable v1.0.3 release for Windows, macOS, and Linux.
The appeal is the combination of old-school OB character and current open-source maintenance. BPB highlighted the refreshed interface, expanded filter section, extra per-voice modulation, ring modulation, multimode noise color, and programmer area as the reasons this fork feels more active than the older OB-Xd branch.
Use OB-Xf when you want an Oberheim-flavored synth that is direct enough for quick patch building but still has enough modulation and filter variety for evolving tones. It is especially useful for producers who like vintage polysynth color but want CLAP, LV2, AU, VST3, and standalone options across the major desktop platforms.
Video Preview
Frequently Asked Questions
Is OB-Xf the same synth as OB-Xd?
OB-Xf is a continuation and modernization of the last open-source OB-Xd release rather than a direct repackage. The Surge Synth Team moved the project into its own infrastructure and added new development around the interface, filters, modulation, and release process.
Can OB-Xf load OB-Xd patches?
The current GitHub README says OB-Xd patches and banks can be imported through the patch browser or by drag-and-dropping FXP/FXB files onto the interface. The README notes that this compatibility arrived in the v1.1 update path, while the official stable download page still lists v1.0.3.
Which platforms and formats does OB-Xf support?
The official OB-Xf page provides stable downloads for Windows, macOS, and Linux. It lists VST3 and CLAP on Windows, VST3, AU, and CLAP on macOS, and VST3, CLAP, and LV2 on Linux.
Should I use the stable release or nightly builds?
Use the stable release for normal production work because it is the official version linked as Download v1.0.3. Nightly builds are also available from the same page, but they change more frequently and are better suited to testing new fixes or features.
