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percussion modules

House Party Drum Station Drum Synthesizer. Audio Demo's. All sequencing was done using the onboard Grids section. A small amount of echo was added to increase the stereo field. This product will be release 2022. More info to come.


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Model: CMOS FX Processor
current:+25mA, -25mA
width: 16hp


Two circuits are on this module.




  1. xor drone generator
  2. discrete transistor based vca with accent.


What does this module do?
**The XOR Drone generator side creates audio. There are three square wave generator that perform xor modulation on each other.
There are 3 linear CV inputs with labeling. You can patch a sequencer, an envelope generator, and vco. There are two AC/DC toggle switch to change the behavior of the CV patch.


When you patch a external vco wave into the XOR generator, it performs a unique hard sync. This is where the term 'CMOS Processor' come into action.

**The discrete VCA portion of the module uses transistors. There is a nice 'rounding' of the sound, a very nice character. There are two CV inputs for the vca; Envelope INPUT, and Accent input. I like to patch a sequencer to the Accent input. An external envelope generator is required.



The Emphasis Button will open the vca, like a gate or hold. There is an output jack to use the button for other modules.


blmcmosfx-ref.pdf
File Size: 1584 kb
File Type: pdf
Download File


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Model: BLM Accented Asteroid Bass Drum
Width: 6hp
Current: +13mA,-11mA

What does this do?
This product is used to produce drum and percussion sounds. You can make 808 style long kick drums, or shorter Tom and drum sounds. The toggle switch is switching between internal capacitors in order to affect the internal oscillator timing. This new updated design has an onboard trigger button, jacks on top, and a slim foot print on the back for the power cable. All capacitors for the circuit are using 5% mylar type.
The small trimmer adjusts the decay length.

The accented feature on this product allows for dynamic, 'volume' changes of the bass drum.

The onboard booster will distort the sine wave into a square-ish wave.

 Price: $140.00

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Model: BLM Arcade Kick
Width: 10hp
Current: +30mA,-24mA

What does this do?
This product is used to produce drum and percussion sounds. You can make 909 type of kick drums. The toggle switch on the left chooses between long and short vca decay. The toggle switch on the left chooses long and short pitch envelope decay. Smack knob control lefts you mix in a noise 'paper' sound for the drum.

-There is onboard distortion to get techno type of kick drums.
-This internal oscillator is triangular core, with internal reset.
-The internal trigger conditioner can take audio rate frequencies.
-There is a manual push button.

Why is there two trigger inputs?
You can mix in two trigger sources to create complex percussion patterns. The internal circuit is using logic 'OR' triggering.

This product was refined for optimum sound and response from the controls. Part values were changed from the original 909 design. This is not a clone.

Price: $165.00
blm_arcade_kick_drum_help.pdf
File Size: 296 kb
File Type: pdf
Download File


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Model: BLM Assist Percussion Utility Module MK2
Width: 12hp
Depth: 1.5", 1 PCB Stack, Skiff Compatible
Current: Current: +18mA, -18mA

Decay Envelope Generator, HI-FI v2164 VCA, and Booster circuit.

What does this do?
This module gives you all the tools needed to make kick drums or percussive sounds using your own vco modules that you have lying around. There is only 3 patch points required to connect this to your VCO module. You connect (2) patch cables to your vco cv inputs, and connect the vco wave output into the ASSIST jack audio in.

Think of this as a drum maker module for dummies. It makes it idiot proof for you to get 909-ish kick drums easily.

The PIEZO jack input allows you to connect drum pads. The ROLAND V_DRUM pad is recommended.


Buy One Now

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Model: BLM Grids MK2
Width: 12hp
Depth: 1.5", 1 PCB Stack, Skiff Compatible
Current: Current: +25mA, -1mA

Percussion Sequencer, Euclidean Sequencer

What does this do?
This module gives you all the patterns needed to make percussive on the fly sequences. It is very simple to use. You just patch the trigger outputs to your external modules. There is an internal clock source.

This product is a Gate Sequencer that uses Grids Firmware written by E. Olivier.

CC-BY-SA-3.0 Project. Files for this can be found on my Survival Page and below. PUBLIC-GRIDS-MK2-V1.2F 2021.zip

The PDF file below is the manual for this product.


public-grids-mk2-v1.2f_2021.zip
File Size: 4886 kb
File Type: zip
Download File

blm_grids_mk2.0.pdf
File Size: 1181 kb
File Type: pdf
Download File


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MODEL: BLM SYNCUSSION PLUS SYNTH
WIDTH: 27hp
CURRENT:+96mA,-86mA

What does this do?
This module is a complete synthesizer mono voice, adjusted for percussion
sounds. There are 3 sections on the mixer: Dual VCO, Shimmer Generator, and White Noise.
There are two trigger circuit inputs on this product: original syncussion trigger conditioner, and
the blue lantern 'Piezo' high sensitivity trigger conditioner. Both trigger inputs can be used simultaneous.
You can use a drum pad on the trigger inputs, or a gate/trigger signal.

-original syncussion trigger conditioner: the sensitivity is close tot he original product. Sticks or hard hits are required on a drum pad.
-piezo trigger input conditioner: the sensitivity is much higher, you can finger tap your drum pad. The sensitivity is so high a 'hanging' patch
cable on this input will trigger infinitely.

-VCO's are triangle based. VCO 1 has a Square wave selected by switch.
-VCO Spread knob separates both vco's pitches from each other to quickly create chord like sound.
-VCO's will respond to 1v/octave input patching.
-There is an FM VCO input for both vco's.

-LFO Section: analog circuit, triangle and square waves selected by switch.
-Has an FM CV input.

-Shimmer Generator: Square wave based XOR ring modded sound generation.
-Has a Linear CV input. The LFO Square wave is switch jack internally connected to this jack.

-VCA circuit is OTA LM13700 based. There is a manual open the vca knob and VCA CV input.
-AM Ring is an internal patch from the LFO to the VCA.

-Sample and Hold. This circuit is using a modern IC LF398 for the S&H.
-The sample is from the White Noise, the trigger input is the clock. This creates a random CV signal for every trigger hit.

The internal Envelope Generators are close to the original syncussion circuit. They react to the trigger signal sensitivity knob, and inputs.

$395.00
blm-sy-plus.zip
File Size: 582 kb
File Type: zip
Download File

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