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Music

Check out my releases on bandcamp, mixcloud and soundcloud



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Warrenty

WARRANTY

All assembled products are covered by a 2-year warranty, as per EU Warranty Law.
The warranty covers any issue in the assembled product caused by a wrong assembly or a defective component.
However, warranty does not cover any failures caused by the user as (but not limited to): using an improper power supply, mishandling of the device, exposition to extreme temperature/moisture/dust levels.
Warranty does not cover the shipping fee to return the assembled product to us, however it covers the shipping fee to ship the replacement/repaired device to the user. Once the device has been returned to me, I’ll give an estimate of the time needed to replace/repair it.
This warranty does not apply to pcb and kits, I’m not responsible for any defects caused by a wrong build by the user, although I’ll offer limited support by email. Of course, if a part is missing from a kit or was defective, I will send you a replacement for free.

RETURNS

All products can be returned within 14 days after the delivery, as per EU Right of Withdrawal.
For any returns, you have to contact me first.
Shipping costs are covered by the user.
Assembled products and packaging must be in perfect condition, kits and pcbs can only be returned if unopened.

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Contact info

martijn[at]reverselandfill[dot]org

Reverselandfill is located in the Netherlands

Reverse Landfill is a project by M. Verhallen.
It is about making experimental / non-structural / non-linear audio & video instruments with the focus on the DIY spirit, which originated from Tekno Soundsystems and Free party spirit, simular to the Open Source ideas.

Reverse Landfill is against Fascism, Racism, Sexism and any other form of disrespect towards people, animals and nature.

Module and project name are derived from toxic and poisonous plants in nature and virtual enviroments.

Reverse Landfill is for open information and music, recycling, experimental expression, squatting, community thinking, TAZ, microfiction, Sci-Fi, Cyberpunk, Noise and more!

I will not bag every part separately or ‘photophy’ every step of the DIY process in a detailed guide. It will rely on you to get to a certain level to be able to build and source parts and use an instrument of experimental status.
Kits are packed in recyclable paper bags and cardboard boxes. No more useless plastic!

I rather not use names or numbers on its panels to indicate values or functions. Instead, I use symbols that will become apparent when playing the instrument.

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Bat Audio

I have a job as Bat Inspector.
The sounds bats make are very interesting, both for biologists and musicians.

This is a link to all my recorded bat sounds of 2024, sorted by month:

Recorded Bat sounds

Use Anabat Insight to process the audio and externally record the results.
If you use the Hetrodyne option, match the frequency to the most active band for the best results.
(you can use the Power Graph to check this (in View, select Power Graph)
See below image for settings

You can do experiments with other software such as Audacity to change the pitch or slow down time with Paulstretch.

Example file:
This is a recording of an Eptesicus Serotinus (Eps) bat. This file comes directly from the Anabat Walkabout. It is very high in frequency, low in gain and should be processed to isolate the bat frequencies.

When using Anabat Insight, set the Heterodyne Frequency to something around 30 KHz .

This is the processed file, played from Anabat Insight and recorded with Audacity
internal recording tutorial
I’ve normalized the audio to -0.1dB.

Here is another processed file, a Pipistrellus Pipistrellus (Ppip) feeding buzz.
The Heterodyne frequency is set to 49 KHz.

Interesting results can be had from other recording settings on the Anabat Walkabout.
(Comb filter, Pitch Shifting, manual Heterodyne, Frequency Division, Time Expansion)
Some of these techniques add more noise which sounds very unique.
I’ll post these later.

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Triple Comparator v6

This new version (v6) has a 8HP black panel and a large pin patchbay for easy patching.
The CV inputs are normalled to the next channels, so you can control all three channels with one CV input patched, or each channel separately with all channels patched.

Features:
3x Bias potmeter
3x CV jack normalised downwards
patchbay with 2×3 inputs, 2×6 outputs, 3x HIGH, 3x GND

The module is designed to accept Eurorack CV voltages. (+10 volt envelopes and -5v +5v LFO signals)
Negative voltages will be clipped and the input voltage is scaled to 0 to 2.5v.

Specifications:
Power usage: powered by the 3TrinsRGB1-c
Reverse polarity protection
8HP Black panel, red knobs
Depth: 25mm
Signals: Video and CV

Note: the Bias potmeters have a wide range. Set the knobs to the middle position and make small adjustments from that point..

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CreepCluster

A drone synth that makes deep and low bass drones with phasing movements.
This tiny desktop unit make a wall of howling sounds!!


Description:

The two Trianglewave oscillators are routed through an analog switch that is clocked at audiorate
by a Squarewave Oscillator, which causes interesting waveshape alterations and phasing effects.
The Lowpass filter can be used to make nice sweeps!

The image on front & backpanel is based on a drawing by me (made in 2020, see below),
white print on matte black.

Note: powering up (and down) takes some time, because the big capacitors have to fill up.

Features:

  • 2x Trianglewave Oscillators with pitchcontrol
  • 1x Squarewave Oscillator with rate control & switchable frequency range
  • 1x Lowpass filter with Cutoff control
  • on-off switch with indicator LED
  • 3.5mm Stereo Jack
  • 9v DC adapter power connection, option for 9v battery

Technical:

  • Size: 100x80x20mm (100x80x40 with knob height included)
  • Power adapter: DC 9v, 200mA, Negative Center BOSS style, 2,1mm barrel
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TFG

The Function Generator is a very useful module to have in a video setup.
You can adjust the “Lights” , “Mids” and “Darks” in the input signal.
Effectively it works a bit like an equalizer, but you can also go negative. This will get you solarised effects.
This Triple edition can be used as a coloriser.

Features:
3x channels with Lighs, Mids, Darks potmeter control
3x Switch for range offset
3x inputs
3x Outputs
Normalisation option

Specifications:
Current draw: +12v: 36 mA, -12v: 74 mA, +5v: 0 mA
Suitable for HD: yes
Reverse polarity protection
14HP Black panel, grey / black knobs
Depth: 23mm
Signals: Video and Audio (optimised for 0-1v LZX format video)

Current version: v5 2025

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XFADE

XFADE: RGB Crossfade module with interesting routings

This module has three crossfade VCAs that can be controlled by one source to achieve RGB fades and wipes.
The VCAs can also be controlled separately as three single crossfaders (fade between 2 sources) and
as three single VCAs (fade between a source and no source, a black image)

The XFADE has 1x crossfade potmeter, 1x switch to change the normalisations.
2×3 input jacks, 3x CV jacks and 3x output jacks.
This way you can crossfade between two sets of full RGB signals with one knob or one CV source.

Other settings let you use the potmeter for crossfading separate channels while controlling one or
more channels with CV sources and disabling the potmeter alltogether, to prevent accidental touching.

The CV voltage range can be set from 0-1volt up to 0-5volt with a trimpot on the backside.

Features:
2x three channel inputs
3x CV inputs
3x output jacks
1x Switch
1x Potmeter

Specifications:
Current draw: +12v : 30mA, -12v : 30mA, +5v: 0mA
Suitable for HD: yes
Reverse polarity protection
8HP panel, white / black knobs
Depth: 23mm
Signals: Video & CV

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Scaler

The Scaler is a 4HP quad voltage scaler designed for use with video modular systems.
The input jacks on Scaler are normalised for easy patching and there are four different build options that are possible with the parts included in the kit.

The four build configurations are:

A) +1v to +5v
B) +1v to +-5v
C) +-5v to +1v
D) +-5v to +-1v

Option A: is for use with modules that have a positive only input (0 to +5v)

If you want to use audio modules as video effects, you can use 2 x Scaler modules: Option B to boost the video voltage up to audio level, and Option C to scale it back down again.

Option C: use this to control your video modules with (audio Eurorack) LFOs , VCOs and other modules that have a +-5v output.

Option D: some video modules can handle +-1v modulation

Specs: 
Current draw: +12v: 11mA, -12v: 11mA, +5v: 0mA
4HP Black panel, grey / black knobs
Depth: 39mm
Reverse polarity protection

Signals: Video (optimised for 0-1v LZX format video)

Simulations:
With the Fallstad circuit simulator

+1v to +5v
+1v to +-5v
+-5v to +1v
+-5v to +-1v

Credits:
This voltage Scaler is based on the LZX Cadet C5
It adds minor mods and has a reduced depth.
I recalculated all optional builds and added simulations.

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Matrix Mixer

The Matrix Mixer is a module for adding color control, feedback routings and advanced mixing to your video system.
It has 3 summing inputs and 1 inverting input. These are all individually routable to the 3 outputs. This allows for RGB color mixing with one extra subtraction channel. The gain levels per channel are adjustable via the pinheader on the back. This way you can use the mixer as a softkeyer with 3x gain, or as a normal mixer with 1x gain.

Features:
12 potmeters (3 potmeters for each input channel)
4x inputs (3x non-inverted, 1x inverted)
3x outputs
amplification header on the backside for 1x or 3x Gain

Specifications:
Current draw: +12v: 25 mA, -12v:25 mA, +5v: 0 mA
Suitable for HD: yes
Reverse polarity protection
14HP Red panel, grey / black knobs
Depth: 25mm
Signals: Video and Audio (optimised for 0-1v LZX format video)

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JOG

JOG is a (video) voltage source with a multiturn Bourns potmeter for precise adjustments.
Finetune your VCO / modulation source / FM inputs etc.

Features:
10 turn potmeter to adjust the output voltage (VAR jack)
4 static voltages
1 variable voltage, switchable from -1v to +1v → 0v to +1v

The range can be adjusted to +5v -5v for audio CV modulation.

Specifications:
Current draw: +12v: 5mA, -12v: 2mA, +5v: 0mA
Reverse polarity protection
8HP black panel, light grey / black knobs
Depth: 24mm
Signals: CV

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CMIX

The CMIX is a 6 channel mixer for LZX format video signals.
It is used for mixing several sources into complex patterns and shapes.

The normal channels add signals together, the inverted channels subtract signals.
The 2nd output allows for (example) a feedback routing option to add complexity and detail.

Features:
3x normal channels , each with a jack input + potmeter
3x inverted channels , each with a jack input + potmeter
2x outputs

Specifications:
Current draw: +12v:20mA, -12v: 20mA , +5v: 0mA
Suitable for HD: yes
Reverse polarity protection
8HP Black panel, grey / black knobs
Depth = 23mm
Signals: Video and Audio (optimised for 0-1v LZX format video)

Current version: v3 2025

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Veratrum

Veratrum
A noise and texture voice with 5 oscillators that go through a pseudo ringmodulator to create chaotic drones, swarming souds and clicks and blips on lower frequencies. There are 2 audio outputs (square swarm & filtered) and one LFO output.

Features:
3x Saw wave VCO with frequency pots and CV input jacks with offset potmeters.
2x Saw wave VCO with 2 touchpad controls (enable + pitch)
1x LFO (Ramp, Saw, Triangle) with rate control potmeter and jack output
1x Vactrol lowpass filter with CV input jack
1x Swarm output (squarewave like)
1x Filtered out (triangle like)

Specifications:
Current draw: +12v: 50mA, -12v: 50mA, +5v: 0mA
Reverse polarity protection
12HP Black panel, grey / black knobs
Depth: 25mm
Signals: Audio

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Nerium

The Nerium is a dual VCA, suitable for mono and stereo signal paths.
With the normalized CV and Audio inputs you can control one sound with 1 or 2 modulation sources,
or two sounds with 1 or 2 modulation sources, for interesting sound variations.

Features:
Dual VCA with a level knob for each channel
Normalized audio & CV inputs

Specifications:
Current draw: soon
Reverse polarity protection
8HP black panel, light grey / black knobs
Depth: 23mm
Signals: Audio

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Pentamix

A five channel audio mixer with 3 outputs for easy feedback routing.

Features:
5x channel audio mixer
5x channel volume potmeters
1x SUM gain potmeter
2x normal outputs
1x inverted output

Specifications:
Current draw: 4mA +12v, 4mA -12v, 0mA +5v
Reverse polarity protection
8HP panel, grey / black knobs
Depth: 27mm
Signals: Audio

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Noise v9

The Synth is based on 4 Squarewave oscillators that modulate each other,
go through a clock divider and are mixed together to create harsh noise and random control voltage.
The result is often unpredictable and evolving, suitable a source for snares, hihats or as ‘unpure’ audio texture designs.
The two switches set the range of OSC1 and OSC2 (3 options per switch)
With the patchbay you can patch two of the the 12 divisions to go to one (four in total) output jack. (20 patchpoint in total)
Each division sounds different and you can make combinations for even more variation!
It is also possible to patch LDRs or resistors into the patchbay, with interesting results.

Features:
4x Squarewave VCO with pitch potmeters
4x CV inputs
2x 3way Range switches (OSC1 + OSC2)
4x Audio outputs
20pin Patchbay on the frontside

Specifications:
Current draw: +12v: 35mA, -12v:0mA, +5v:0mA
Reverse polarity protection
8HP panel, grey / black knobs
Depth: 33 mm minimum
Signals: Audio and Video (optimised for audio voltages, attenuate for video)

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Monotropa v7

7 channel EQ feedback distortion with CV over the feedback loop.

The Monotropa is an extreme sound destructor, weird oscillator, equalizer distortion.
This version has 7 equalizer bands and voltage control over the feedback path via a vactrol lowpass gate as well
as a minimum direct feedback level connected to the SEND and RETURN path. This way you can add even more control over the feedback sound.

The SEND and RETURN path allows you to route additional effects into the feedback chain, such as filters and delays or even FM oscillators.

Features:
gain of 7 EQ bands
minimum level of direct feedback (feedback that is normalled through the SEND & RETURN path)
CV amount (feedback that passes the lowpass gate path)
1x input
1x output
1x CV input
1x Send & return in the feedback path

Specifications:
Current draw: +12v: 23mA, -12v: 23mA, 5v: 0mA
Reverse polarity protection
12HP panel, grey / black knobs
Depth: 25mm
Signals: Audio

Current version: v7.4 2025

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Monotropa v4

The Monotropa is an extreme sound destructor, weird oscillator, equalizer distortion.
This version has 4 equalizer bands and voltage control over the feedback path via a vactrol lowpass gate as well
as a minimum direct feedback level connected to the SEND and RETURN path. This way you can add even more control over the feedback sound.

The SEND and RETURN path allows you to route additional effects into the feedback chain, such as filters and delays or even FM oscillators.

Features:
4 band feedback EQ distortion.
1x audio input
1x audio output
1x CV input
1x EXT audio input & 1x EXT audio output (SEND RETURN path)

Specifications:
Current draw: +12v: 12mA, -12v: 5mA, +5v: 0mA
Reverse polarity protection
8HP black panel, light grey / black knobs
Depth: 23mm
Signals: Audio

Current version: v4d 2025

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Aconitum v2

A dual 3 channel mixer with analog noise.
Why not add some noise into the mix? Raise that NoiseFloor!!
The 3th volume potmeter on each channel controls the Noise level.
Channel 1: white noise
Channel 2: blue noise
The Noise is normalized to the jack, so you can bypass the noise when you patch another signal into input 3 of each channel.
The inputs of channel 1 are also normalized to channel 2, to expand the possible routings.

Features:
dual 3 input audio mixer
2x 3 audio inputs
2x 1 audio outputs
2x 3 level potmeters
2x noise (white & blue)

Specifications:
Current draw: +12v: 3mA, -12v: 4mA, +5v: 0mA
Reverse polarity protection
8HP black panel, light grey / black knobs
Depth: 23mm
Signals: Audio

Current version: v2

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SNOW

A two channel analog video (transistor based) noise source, with some nice additions
such as offset and volume controls, highpass filtered outputs and a comparator (with switchable noise channel)
to create very interesting chaotic textures (from starfields to blizzards)

Features:
2x noise channels with Offset and Volume pots
1x comparator (selectable noise channel) with Bias pot
2x offset noise outputs
2x filtered outputs
1x comparator output

Specifications:
Power usage: ?
Suitable for HD: yes
Reverse polarity protection
8HP panel, grey / black knobs
Depth: 25mm
Signals: Video and audio (optimised for 0-1v LZX format video)