X-Or

X-Or is a focused mono synth built for bass parts, sub layers, pedal tones, and simple two-oscillator saw sounds.

The voice architecture is deliberately narrow: two free-running saw oscillators feed a resonant low-pass filter, then a loudness envelope and output stage. OSC A tracks incoming MIDI, while OSC B can be offset by semitones and cents
for octave/fifth stacks or subtle detuned beating. A crossfade control blends the two oscillators.

The filter includes cutoff, resonance, and a dedicated attack-decay contour envelope for plucky bass movement. The loudness envelope uses attack, sustain, and decay, with soft retriggering so legato note changes do not force the
envelope abruptly back to zero. Glide is available for overlapping MIDI notes, while non-overlapping notes retrigger normally.

X-Or also includes a resizable interface with a live waveform/spectrum chart and output meters, plus preset save/load, A/B compare, copy/paste, undo/redo, and user preset import/export.

X-Or is free of charge. It requires no license key, no activation, no account, and no internet connection.

Key Features.

- Free monophonic bass synthesizer.
- Two free-running saw oscillators.
- OSC B coarse and fine tuning.
- Oscillator mix crossfade.
- Resonant low-pass filter.
- Dedicated filter contour envelope.
- Loudness attack/sustain/decay envelope.
- Soft retrigger for smoother legato transitions.
- Optional glide for overlapping notes.
- Built-in waveform and spectrum display.
- Output meters.
- Preset save/load and import/export.
- A/B compare, copy/paste, undo/redo.
- VST3 and CLAP.
- Windows and Linux.
- No activation, no account, no online check.

System / Format.

- Plugin formats: VST3, CLAP.
- Platforms: Windows 10/11 64-bit, Linux x86_64.
- macOS: not included in the initial release.
- Latency: 0 samples.
- Price: free.