LFO RND for Elektron Analog Rytm

A second LFO page: two random modifiers per sound, each offsetting a chosen parameter by a new random amount on every note.

Module version 1.2.0. Base firmware: 1.74.

About this module

LFO RND adds a page behind the LFO page key: press LFO again to reach it. It holds two random modifiers per sound. Each has a destination (DS1, DS2), one of sixteen parameters taken from stock's LFO destination list (the eight machine parameters, FIN, STA, FRQ, RES, DEC, PAN, DEL and REV), and a depth (DP1, DP2), 0 to 64 in sixteen steps. On every note trig each modifier draws a random offset between -depth and +depth for its destination, clamped to the parameter's range and held until the next note, on top of p-locks, slides and LFO 1. The settings are kept in the sound through core-ar2's mod storage. It is rytm2_mods' elemod port of MrScruff's rytm-mods 0004-lfo-rnd; from 1.2 its page and knobs go through core-ar2's page tables (core_pages, core_params, core_view_pages) instead of detours of its own.

• Two random modifiers per sound, each with its own destination and depth.
• Sixteen destinations from stock's LFO list; depth 0 is stock behaviour.
• A new value on every note, held until the next one.
• Saved with the sound in core-ar2 mod storage.

How to use it

1. Use a build containing LFO RND. Open the LFO page on a voice track and press the LFO page key again: LFO RND shows DS1 and DS2 on knobs A and B, DP1 and DP2 on E and F.
2. Turn DS1: the destination list opens. Pick FRQ and press YES, then turn DP1 to 32.
3. Play trigs on that track: the filter cutoff moves to a new random value on every note. Turn DP1 to 0: the notes play as stock again. Press LFO once more to go back to the LFO page.

Controls

DS1 (knob A, LFO RND page)

Random modifier 1's destination: opens stock's LFO destination list, limited to sixteen entries (the eight machine parameters, FIN, STA, FRQ, RES, DEC, PAN, DEL, REV). YES confirms.

DS2 (knob B, LFO RND page)

Random modifier 2's destination, as DS1.

DP1 (knob E, LFO RND page)

Random modifier 1's depth: sixteen steps from 0 to 64. Each note offsets DS1's parameter by a random amount between -DP1 and +DP1. 0 is off.

DP2 (knob F, LFO RND page)

Random modifier 2's depth, as DP1.

Compatibility notes

• Built for OS 1.74 only. 1.2.0 reaches its page and knobs through core-ar2's page tables (core_pages, core_params, core_view_pages; core-ar2 0.4 and later; Modwerk's base is core-ar2 0.7). 1.1 and earlier detoured those page routines itself and does not link with core-ar2 0.4 or later.
• Voice tracks only: the FX track has no LFO RND page.
• DS1, DS2, DP1 and DP2 cannot be p-locked, scene-locked or modulated; they are sound settings (lfo-rnd 1.3 adds that, but needs core-ar2 0.9).
• Needs core-ar2's mod storage: one 16-bit sound field (lfo_rnd_cfg). On stock firmware, or a build without this module, the sound plays without the random offsets.
• Sounds saved by lfo-rnd 1.0 (which kept the settings in the sound's parameter word 0) keep them; the first edit moves them into mod storage.
• Hooks the audio interrupt next to Loop Sync's site (different bytes); the pair has not been run together.

Test evidence

Hardware: lfo-rnd 1.2 on an Analog Rytm MKII, OS 1.74, with core-ar2 0.4 and the other rytm2_mods ports (P4A4, Q4A4, U4A4, 2026-10-21): the page through core's page tables, its list and depths, offsets per note, settings kept through save and power cycle. Modwerk's package linked with core-ar2 0.7 is byte-identical to rytm2_mods v1.3's release object linked with it. Emulator on the Modwerk base (LR12): page, list, DS1 and DP1. Not yet on a unit with Modwerk's base.