Aurorus

Morphing chorus/flanger/phaser firmware for the Qu-Bit Aurora Eurorack module.

Features

Aurorus turns the Aurora into a single continuously-morphing modulation effect. Turn one knob and slide smoothly from chorus, through flanger, into phaser — no switching, no discrete modes, just one knob sweeping through all three classic modulation textures.

• Continuous morph — one knob crossfades chorus → flanger → phaser using an equal-power curve, so the effect never dips in volume mid-sweep and only two textures are ever blended at once
• Shared rate, depth, feedback, and mix controls — the same four knobs shape whichever effect (or blend) is currently active
• Stereo width — detunes the left/right modulation rate against each other so the effect blooms into stereo instead of collapsing to mono
• Freeze — holds the current modulation phase in place while held, for a static, frozen texture
• Reverse polarity — inverts the wet signal, the classic hardware flanger "through-zero" switch, most audible with feedback dialed up
• LED mood indicator — all LEDs show one blended colour (blue → green → magenta) reflecting where you are in the morph, breathing in brightness at the modulation rate and depth

Download

Pre-built firmware is available on the Releases page.

1. Download aurorus.bin from the latest release
2. Copy it to the root of a FAT32 USB drive (it must be the only .bin file there)
3. Insert the USB drive into the Aurora module
4. Power up the module with the drive inserted — the bootloader loads the firmware automatically
5. Power down and remove the drive; check daisy_boot_log.txt on the drive to confirm a successful flash

Controls and Behaviour

Knobs

Buttons

CV Inputs

Each CV input sums with its knob and clamps to the 0-1 parameter range: the knob sets the center, CV swings the parameter around it. Turning a knob toward center leaves more room for CV to swing before it clips at either end; turning it toward an extreme leaves less. The Freeze and Reverse gate inputs remain unused — both controls are front-panel/button only.

Audio

Aurorus is a single audio effect that continuously morphs between chorus, flanger, and phaser. The Warp knob drives a two-zone equal-power crossfade — chorus fades into flanger over the first half of its travel, then flanger fades into phaser over the second half — so only two effects are ever blended at once and the perceived volume stays constant through the sweep.

Time, Blur, Reflect, and Mix apply identically to whichever effect(s) are currently active. Atmosphere widens the stereo image by detuning the left and right modulation rates against each other, rather than by panning.

Holding Freeze stops the sweep instantly, wherever it currently sits. Holding Reverse flips the wet signal's polarity before it's mixed back with the dry signal — with Reflect turned up, this noticeably shifts the notch/peak character of the effect.

LEDs