Updated Features & V2 Panel for 2025

With the many new functions since the launch of the Arp Of Darkness in early 2024, it was time for a new faceplate to compliment the myriad of features in the latest firmware.

The Arp Of Darkness is an arpeggiator with a unique twist: it builds dynamic, evolving note sequences using a buffer approach inspired by shift registers and Turing Machines. Unlike traditional arpeggiators that play predefined chord patterns, this module lets you enter notes sequentially into a buffer of variable length — 3 to 16 notes — and play it back in 6 modes: Forward, Backward, Exclusive Ping-pong, Inclusive Ping-pong, Golden Ratio, and Random. Each mode offers both queued and immediate selection, plus reset on the fly.

Golden Ratio Mode? is an especially musical one — based on the Fibonacci Sequence, it steps through your buffer using φ-based intervals for patterns that feel both intentional and organic.

You can save and load your buffer to EEPROM — find a phrase you love, save it, evolve it into something completely different, then reload your original to restate the idea.

What's New in v1.4.0 (Updated 05/29/2026)

CV Keyboard Mode
Hold the High C (Shift) button at boot to enter a full monophonic CV keyboard with gate output and portamento via the pot. Play notes directly without swapping firmware.

Remix Buffer
A quick dual-tap of Octave Up + Octave Down shuffles the note order in your buffer on the next clock. Note values stay the same — only the sequence changes. Great for breaking out of a pattern on the fly without losing your phrase.

Auto-Remix
Set the buffer to reshuffle itself automatically every 2, 4, or 8 loops. Activate queued (waits for the end of the current loop) or immediate (fires on the next clock). Deactivate anytime with the same dual-tap.

This module is a part of the Nocturne Alchemy Platform - a flexible eurorack module series that shares the same robust Arduino-based hardware, allowing one to effortlessly swap firmware and functionalities through an intuitive web loader. By purchasing one module, you gain access to a full range of freely available firmwares, including the other current creations, Slight of Hand and Shroud Of Turing, and Seventh Summoner, as well as more planned for future release! It's like getting multiple modules for the price of just one!

Specs
* 1U (Intellijel format) 26HP Module
* 40mm skiff-friendly depth
* Current Draw: 40 mA +12V, 0 mA -12V, 0 mA 5V

Features
* 4 octaves of control from C0 to C4
* 6 note buffer lengths (3, 4, 5, 6, 8, 16)
* 6 playback modes (Forward, Backward, Exclusive Pingpong, Inclusive Pingpong, Golden Ratio and Random) with cycle select, direct select, (queued & immediate) and reset.
* Save, load, and clear buffer sequence for persistence after reboot, or on the fly for performance
* Clock input and CV out calibrated to 1V/0
* Calibration mode with tuning for each note across 4 octaves (Comes pre-calibrated)

User Manual: Arp Of Darkess User Manual V1.3.2
Website: https://www.flatsixmodular.com

MORE EXPLANATION

The Illusion of Randomness
The Arp Of Darkness is designed to leverage a musician's imperfect memory, creating the illusion of randomness. While the module provides structured playback modes, the human element introduces a layer of unpredictability. As musicians input notes and adjust settings, the evolving sequences can feel spontaneous and ever-changing, much like a Turing Machine or a Shift Register. However, the Arp Of Darkness stands out by inviting the musician's memory and intuition into the creative process, resulting in a unique and personalized musical experience.

Shift Register-ish Behavior
The Arp Of Darkness employs a similar concept to a shift register for handling note entry and playback. As new notes are entered into the buffer, older notes shift through the buffer and eventually "fall off" when the buffer is full. This process creates evolving sequences that change over time, offering a dynamic and engaging musical experience.

Step-by-Step Explanation
* Step 1: Initial Note Entry - When you enter the first note using the tactile keyboard, it is stored in the first position of the sequence buffer.
* Step 2: Filling the Buffer - As you enter more notes, each new note pushes the existing notes one position forward in the sequence buffer. For example, entering a second note moves the first note to the second position and places the new note in the first position.
* Step 3: Buffer Overflow - When the sequence buffer is full (based on the potentiometer setting), entering a new note causes the oldest note to "fall off" the buffer as all notes shift one position forward. The new note is stored in the first position, and the sequence continues to evolve.
* Step 4: Continuous Evolution - The Arp Of Darkness allows for continuous evolution of the sequence. As you enter new notes, older notes shift through the buffer, ensuring that the musical pattern is always changing and never static.

Practical Example
Imagine you set the sequence buffer length to 8 notes and begin entering notes:
Enter C -> Buffer: [C]
Enter E -> Buffer: [E, C]
Enter G -> Buffer: [G, E, C]
Enter B -> Buffer: [B, G, E, C]
Enter D -> Buffer: [D, B, G, E, C]
Enter F -> Buffer: [F, D, B, G, E, C]
Enter A -> Buffer: [A, F, D, B, G, E, C]
Enter C -> Buffer: [C, A, F, D, B, G, E, C]
Enter E -> Buffer: [E, C, A, F, D, B, G, E] (Oldest note "C" falls off)

https://flatsixmodular.com/arpofdarkness/