Borg ER-3 is a portable (SDL) audio synthesizer / tone generator inspired by the Korg ER-1.
It is a fixed-state modular synthesizer using Frequency, Amplitude, Resolution, and Transformation (FART) oscillators. Tthe resolution regards harmonic resolution and transformation regards the wave-shape being produced by the oscillator.
The envelope can be clicked and dragged into any shape, the biquads can be manually configured on a per coefficient basis, they are executed in sequential order so BIQUAD 1 executes first.
This is free and open source software.
Key Features
- Wave shape order: Sine, Slanted Sine, Square, Saw, Triangle, Impulse, Violin.
- Binds to play audio: spacebar, mouse3, mouse4
- Reset envelope: right click on it
- Scroll dial sensitivity selection: right click, three sensitvity options
- Adjust dials by left click and drag or hover and scroll mouse 3 in the Y axis.
- BIQUADS are executed from left to right, first BIQUAD 1, then 2, then 3.
- You can use the Load button to reset any changes since your last Save.
- You can mouse scroll zoom the oscilloscope, right click to reset zoom.You can hold the space bar while turning the dials to hear and see their effect in real-time.
- Flip sign of dial by mouse3 or mouse4 clicking on it.
- Reset/disable multiple selection button: right click on button.
Website: github.com/mrbid/Borg-ER-3
Support:
Developer: James William Fletcher
License: MIT License

Borg ER-3 is written in C. Learn C with our recommended free books and free tutorials.
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Read our verdict in the software roundup.
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