v0.7.0

Hollow Saint 0.7.0: Lo-Fi Relic and Crank & Tremor

A haunted hurdy-gurdy for the original OP-1: a synth engine plugin for the Hundekraft OP-1 Workshop 3.0.x. Bowed melody strings, a drone that can hold a key like real bourdons, a buzzing bridge that kicks in on wheel strokes locked to the OP-1's tempo, and a cathedral that darkens, rings and tolls a distant bell. Pure synthesis, no samples.

Pre-release: 0.7.0 has been tested in a PC build and in a Blackfin (OP-1 processor) simulator, and is now being tested on real OP-1 hardware. Please report anything odd in Issues.

What's new in 0.7.0

• Lo-Fi Relic (push green). The sound goes through a worn old tape before it reaches the cathedral: wow and flutter, warm saturation, a lower sample rate and fewer bits, dust, a darker tape head, a little hiss and a sagging transport. While it's on, turning green sets how old the tape is. It stays about as loud as the clean sound, and switching it on or off fades over ~35 ms, so it doesn't click.
• Crank & Tremor (white). The wheel strokes now also pulse the level and the string's tone. WHEEL BUZZ low gives slow, breathing swells, the middle gives a steady mechanical tremolo, and high gives an aggressive rattle with a deep pulse.
• Two new stroke rates: steady, 1 bar, 1/2, 1/4, 1/8, 1/8 triplet, 1/16.
• Screen: a worn cassette with turning reels and an age meter appears while the relic is on, with dust in the cathedral. There are icons for all 7 rates.
• Presets updated: midnight vigil breathes once a bar, crypt drone and drowned bell swell every half bar, and each preset has its own relic age.
• Faster (from 0.6.1): about 38 % fewer processor cycles than 0.6.0, with exactly the same sound. With the relic off and the wheel on steady, 0.7.0 sounds bit-for-bit the same as 0.6.1.

The encoders

Knob	Turn	Push
🔵 Blue: DRONE	off, subtle and dark, rich and resonant, dense with a sub-octave	the drone's key: FOLLOW (your lowest note) or a fixed key C to B
🟢 Green: STRINGS	soft hollow flute, nasal hurdy-gurdy, bright and cutting	Lo-Fi Relic on/off; while on, green sets the tape's age
⚪ White: WHEEL BUZZ	smooth, breathing swells, mechanical tremolo with buzz, aggressive rattle	the stroke rate, synced to the OP-1's tempo
🔴 Red: CATHEDRAL	dry and close, hollow and old-world, a dark huge space with a distant bell	none

Install

1. Your OP-1 needs the Hundekraft firmware 3.0.x.
2. In the Workshop, open Your plugins, add hollow_saint.knl, connect by USB, click Update OP-1, then press T1 on the OP-1 to confirm.
3. On the OP-1, press synth, then Shift + T1, and pick hollow saint.
4. Presets: unzip hollow_saint-0.7.0-presets.zip. On the OP-1, press Shift + COM, then T3 (disk mode). Copy the hollow saint folder from synth into the OP-1's synth folder, then eject.

If the OP-1 won't start after you add the plugin, power-cycle it. It boots once without plugins, and you can then remove the plugin in the Workshop.

Files

• hollow_saint.knl: the plugin (40,548 bytes)
• hollow_saint-0.7.0-presets.zip: the 8 presets (hollow saint, midnight vigil, howling dog, ash procession, bone flute, crypt drone, plague dance, drowned bell)
• hollow_saint_0.7.0_demo.mp4: a 4-minute demo of the engine, the new features and the presets. It was rendered on a PC from the plugin's own sound and screen code, not recorded on an OP-1.
• SHA256SUMS.txt: checksums

Licence: GPL-3.0-or-later, with the OP-1 firmware permission (see LICENSE and NOTICE).