HIERDAN for WOAS

A new WOAS beat engine: HIERDAN

The second engine you can swap in and out on a microSD card.

HIERDAN is a tight, responsive synthesis system featuring enhanced sync and MIDI capabilities.

• The ‘5V TAP’ input now functions as a CV clock sync. It expects a 1 or 2 PPQN signal or an equivalent pulse that rises from 0V.

• Flipping the ‘DYNAMICS’ switch down allows you to fade in respeeding sampler using 'MUTATION'. It captures snippets of your rhythms and replays them at random speeds, producing glitchy, high-frequency skitters. This creates self-similar subrhythms derived from your original material.

• ‘WAVESNAP’ now serves as the tap input for a rhythmic tremolo applied to the audio input. Flipping ‘START’ down clears the recorded rhythm. It works with both mono and stereo signals.

• The built-in tempo-synced delay now includes modulating filters, adding spectral character to the echoes.

• Each voice outputs MIDI on a dedicated channel (1 to 4), letting you route them individually over USB. The Shape control maps note numbers across the 0–127 range, while velocity follows your DYNAMICS setting, just like the stock WOAS.

• MIDI clock is received over the USB power connection.

• The unit also accepts MIDI notes and velocity (as per the stock WOAS), though the input mapping differs from the output mapping mentioned above. This prevents feedback and enables layered sequencing.

You can buy a preloaded microSD card or download the disk image and make your own using Balena Etcher. You will need a 4GB or larger card.

Replacing your WOAS beat engine:

1. Disconnect all cables from your WOAS.
2. Turn over the device, unscrew and remove the 8 screws on the back panel.
3. Remove the back panel.
4. Locate the SD card holder at the bottom of the circuit board.
5. Press the SD card lightly to release it, trying not to touch the circuit board.
6. Remove the SD card.
7. Slot in the new SD card and push lightly to latch it in place.
8. Replace the back panel and screws.
9. Your WOAS is ready to use!