🎛️ Modulation Matrix

Most of this pack's nodes are one knob per function. ModulationMatrix is different: it's a single node that acts like a modular synth patchbay, generating control signals - LFOs, an envelope, an audio follower, random - and routing them through up to eight modulation amounts to shape your sound. It's the most "synth-head" node in the pack, and the one that rewards patience.

What it is

You feed it an audio input and it returns modulated_audio - the input processed by whatever the internal matrix is doing. The matrix_size (4, 6, or 8) sets how many routing slots are active, and global_intensity (0–2) scales the whole modulation output. update_rate (1–1000 Hz) sets how often the modulation is recomputed - low rates give you stepped, zippery movement; high rates approach smooth continuous modulation.

The sources are set up through the optional inputs:

• LFO1 and LFO2 - each with a frequency (0.01–100 Hz) and a shape (sine, triangle, sawtooth, square, random, smooth_random). LFO1 defaults to a 2 Hz sine, LFO2 to a 5 Hz triangle.
• Envelope - a full ADSR (envelope_attack, decay, sustain, release) that responds to the input's amplitude.
• Audio follower - follower_sensitivity, follower_attack, follower_release turn the input's loudness into a control signal, so your own audio drives the modulation.
• Random - random_rate and random_smoothing for stepped or smoothed random values.

How it works

The routing is done by modulation_amount_1 through modulation_amount_8 - each one, −1 to 1, sets how much of a source feeds a particular modulation target inside the processor. Positive amounts push one way, negative the other. It's a black box in the sense that you can't see exactly which target each slot drives - you sculpt by ear - but the outputs help: besides modulated_audio you get matrix_report (a STRING describing the routing) and live lfo1_value, lfo2_value, envelope_value, and follower_value FLOATs you can display or wire elsewhere.

Honest caveat: the README advertises "chaos" and "step sequencer" sources in addition to these. The current node exposes LFOs, envelope, follower, and random - so treat those as the real feature set, and don't go hunting for inputs that aren't on the node.

The inputs that matter

• global_intensity - your master dial. Start at 0.5 and build.
• lfo1_frequency - the single most musical control here. Slow (under 1 Hz) gives long evolving sweeps; up toward 20+ Hz you get tremolo/wobble territory.
• modulation_amount_1 through 8 - the actual routing. Leave them at 0 and nothing happens; they're the point of the node.

Install

cd ComfyUI/custom_nodes
git clone https://github.com/eg0pr0xy/comfyui_noisegen.git
cd comfyui_noisegen
pip install -r requirements.txt

Windows embedded Python: ComfyUI\python_embeded\python.exe -m pip install -r requirements.txt. Or ComfyUI Manager, search "NoiseGen" / eg0pr0xy. No models, no keys.

Gotchas

The pack rule stands: don't skip the pip install (scipy at module load takes the whole pack down with it). And be patient with this one - with all the amounts at 0, which is the default, it does nothing, and that's confusing the first time you hit it. Turn global_intensity up, nudge an lfo1_frequency in, then start raising the modulation_amount_* slots one at a time so you can actually hear what each route does. Trying to dial all eight at once is how you get a wall of noise you can't untangle.