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This free multiband bitcrusher is a surgical tool for lo-fi sound design.

If you like your sounds distorted, degraded and loaded with lo-fi character, then the humble bitcrusher is your friend.

By reducing the bit depth and sample rate of a signal, this audio effect produces crunchy textures, gritty timbres and artifacts reminiscent of vintage digital gear: it’s a powerful tool for creative sound design, capable of achieving everything from subtle fuzz to total sonic destruction.

Many DAWs have a stock bitcrusher onboard, like Ableton Live’s Redux or Logic Pro’s Bitcrusher, but these tend to be on the simpler side. BIT LAYER, a new plugin from RiverFlux Audio, takes things to a different level, allowing you to precisely target your digital degradation with a multiband architecture, mid/side routing and tonal/transient processing. This adds up to more versatility than many paid-for bitcrusher plugins, and it’s totally free.

Bit Layer can dial in up to eight independent layers of processing, each with dedicated controls for bit depth, sample rate and jitter (all three can be reordered in the signal path) along with mute, solo, gain and dry/wet mix.

The plugin’s multiband functionality makes it possible to apply lo-fi texture in varying degrees and styles across the frequency spectrum, and this can be seriously useful for surgical sound design. You could crunch up the hi-hats in a drum loop while leaving the kick drum untouched, for example, or add some ear-catching grit to the high-end of a vocal without distorting the mids and lows.

The plugin’s targeting abilities extend beyond the frequency spectrum and into the stereo field, too: all three modules across each band have mid/side routing, so you’re able to apply the effect independently across mid (the sum of the left and right channels) or side (the difference between the two) channels.

There’s also tonal/transient splitting across each band, meaning that you can treat the transient (attack) portion of a signal independently to its sustained tonal content, once again opening up new possibilities for fine-tuned signal corruption.

All in all, this is a respectable amount of flexibility for a free plugin. If you’re looking for an upgrade to your DAW’s stock crusher but you’re not already in possession of one of the more full-featured paid-for options on the market, Bit Layer looks like a capable alternative.

RiverFlux Audio BIT LAYER is available now for Windows and Linux in VST3/CLAP formats, with AU support on macOS.

Head over to Gumroad to download the plugin.

Overtonium is a free, open-source 32-partial additive synthesizer that gives each harmonic its own channel-style controls for tuning, envelopes, modulation, stereo placement and level.

Developer Benjamin Dehli has introduced Overtonium, a free additive synthesizer plugin for Linux, Mac and Windows.

Overtonium approaches additive synthesis like a 32-channel mixer, with each channel representing a sine oscillator locked to a harmonic of the played note. Each partial has its own tuning, envelope, modulation, velocity, aftertouch, panning and level controls, while a separate noise channel provides additional non-pitched sound.

A central feature is the TUNE control, which continuously moves each partial between its equal-tempered position and its exact whole-number harmonic ratio. The instrument also separates this partial tuning system from keyboard temperament and inharmonic stretch, with six keyboard temperaments available: equal, just, Pythagorean, quarter-comma meantone, Werckmeister III and Young.

The instrument supports MPE, channel pressure and polyphonic aftertouch, along with per-partial pitch and amplitude modulation, random pitch drift, two-stage envelope behavior and global effects including wobble, tape echo and reverb. Twenty-eight presets are included.

Features:

• 32 sine-wave harmonic partials
• Separate noise channel
• 32 channel-style partial strips
• Individual tuning for every partial
• TUNE control that moves partials between equal temperament and just harmonic ratios
• Inharmonic STRETCH control
• Six keyboard temperaments
• Adjustable keyboard root and reference pitch from 415 to 466 Hz
• Keyboard tracking
• Per-partial phase control
• Per-partial pitch modulation with eight waveform shapes
• Per-partial amplitude modulation with seven waveform shapes
• Per-partial random pitch DRIFT
• Individual delay, attack, decay and sustain envelope controls
• Separate KEY OFF envelope
• Independent velocity response for every partial
• Independent aftertouch response for every partial
• Channel pressure and polyphonic aftertouch support
• MPE support
• Per-partial stereo panning
• Individual mute, solo and level controls
• Global WOBBLE effect
• Tape echo with two paths
• Global reverb
• Master level control
• Twenty-eight factory presets
• User preset saving and folder-based preset organization
• macOS, Windows and Linux support
• AGPLv3 open-source license

Overtonium is available now as free software under the GNU Affero General Public License v3. The complete source code is available through the project’s repository.

Developer Dave Whiting shared this preview of Wave Emulation, a software recreation of the classic Waldorf Wave, a hybrid wavetable synthesizer known for hybrid synth engine, featuring gritty digital oscillators paired with analog filters.

“Rather than simply making a modern synth that sounds similar,” says Whiting, “I’ve tried to reproduce the structure and behaviour of the original machine.”

Wave Emulation models:

• The Wave’s 250 kHz, 8-bit time-multiplexed wavetable oscillator system
• Signed mixer overflow—including the characteristic Waldorf “ASIC Mix Bug”
• Digital 12 dB high-pass filtering
• CEM3387-style reconstruction filtering, resonant four-pole low-pass filtering, VCAs and panning
• 12-bit stepped control voltages, sample-and-hold behaviour, saturation, noise and output coupling
• Three independent 16-voice WDV boards, matching a fully expanded 48-voice Wave
• The original 480 × 64 monochrome LCD and front-panel workflow

The instrument can also run authenticated Waldorf Wave OS 1.700 firmware. An emulated 68000 CPU executes the original main operating system, while a second runtime executes the genuine WDV voice-board program. Their shared-memory communication, voice-update masks, semaphores and hardware-register writes are reproduced and traced inside the model.

Whiting notes, “The oscillator ASIC itself remains undocumented, so its internal operation is represented by a behavioural model based on the Wave’s published architecture, firmware activity and known hardware characteristics. This is therefore an ongoing reverse-engineering and preservation project—not a claim of perfect, bit-exact emulation.”

Wave Emulation is available now as an open source project via Github.