NEWS
March 28, 2026
Retromulator 1.3 released
Retromulator is a hardware synthesizer emulation plugin featuring cycle-accurate Motorola DSP 56300 virtual analog cores, physical modelling, FM synthesis, and sample playback — available on macOS, Windows, and Linux as AAX, AU, VST3, and Standalone.
Version 1.3 delivers a major OpenWurli 0.3 upgrade with circuit-modelled preamp and tremolo, a new high-quality Speex resampler, and important bug fixes across OPL3, Standalone, and AU.
Improvements
- OpenWurli 0.3 Preamp: Melange-generated 12-node DK preamp circuit solver replaces analytical DkPreamp — closer match to Wurlitzer 200A preamp nonlinearity.
- OpenWurli 0.3 Tremolo: Twin-T circuit tremolo oscillator replaces sine LFO — fixed ~5.6 Hz rate matching real hardware (tremolo rate parameter removed).
- OpenWurli 0.3 Gain: Recalibrated post-speaker gain from +13 dB to +10.5 dB to match Brad Avenson's 2-7 mV measurement.
- OpenWurli 0.3 Speaker: Speaker tanh saturation bypassed at character=0 to prevent nonlinear coloration on polyphonic ff chords.
- OpenWurli 0.3 Cleanup: Removed unused filter classes (OnePoleHpf, OnePoleLpf, TptLpf, DcBlocker).
- Resampler: Replaced libresample with Speex resampler (quality 5) — SNR improved from 75 dB to 107 dB at the same CPU cost.
- Disk Operations: Added backup/restore on None machine core.
Bug Fixes
- Fixed OPL3 preset navigation switching bank instead of stepping through patches.
- Fixed Standalone preset not sounding on project reopen — deferred sysex resend was never triggered because the Standalone host provides no BPM transport.
- Fixed AU setCurrentProgramStateInformation overwriting DX7 voice bank RAM on state restore.
This update is free for all Retromulator 1.x customers. Retromulator is available for Windows, macOS, and Linux in AAX, AU, VST3, and standalone formats.
