ALM Busy Circuits

Notes: ***B-STOCK: Box opened, product in perfect working order***


'Beast's Chalkboard' is dual channel stepped voltage source and adder for your eurorack modular synthesizer system. It primarily is intended as a dual octave switcher for VCO's but has many other uses including sequence transposition, FM ratio creation, buffered CV distribution and VCO calibration.

Technical Specifications:

Supply: +/-12V (Reverse voltage & polyfuse protection)
Current Draw: ~30ma
Size: 6 HP
Depth: 22mm (including power header)
Offset Error: +/- 10mV

Notes: The mmMidi is a simple & compact MIDI interface for your Eurorack synthesiser. It translates two independent channels of MIDI note, velocity and gate information to corresponding control voltage signals via either a classic MIDI DIN type connection or as a driverless USB MIDI device.

The mmMidi also converts MIDI Clock to analogue x24 fixed clock and run outputs (i.e DIN Sync). The optional mmT expander provides a third MIDI channel of 8 key mapped gate outputs.

Requiring minimal configuration and a pain free set up, the mmMidi makes it easy to sync Pam's clock to your DAW, control multiple synth voices, and trigger drum or sample modules with the optional mmT expander. The new USB-C connection makes it easy to drive your modular not just from your computer but also via your tablet, phone or any USB MIDI Host.

(Note: New 2025 mkII version adds USB-C functionality.)

Technical Specifications

Power: +12V 50mA / -12V 0mA
Size: 4HP
Depth: 38mm
MIDI response latency: 200-400 uSec
Resolution: Factory calibrated 12 bit 0-8V CV outputs. +5V gates

Notes: Great value from this compact filter module. The Pip Filter is a 12dB/oct resonant design with built-in normalled VCA and a trigger input for pinging. Lots of functionality and creative potential packed into 4 HP.

Supplier's Notes:
Compact Low Pass Filter and VCA

The 'Pip Filter' is a compact 4HP voltage controlled 2 pole low-pass filter with resonance, a 'pingable' trigger input and built in VCA.

Filter cutoff is controlled via both knob control and dual CV inputs with a built in attenuverter.

Resonance is manually controlled and will reach into self oscillation with rough V/Oct tracking.

A trigger input allows the filter to be pinged for percussive plucked type sounds. Finally, a built in VCA (normalled open) allows for additional independent amplitude control of the filtered signal.


Technical Specifications

Size: 4HP
Power: +12V 25mA / -12V 25mA
Depth: 32mm (approx)

Notes: Compact Analogue LFO & VCO

The 'Pip LFO' is a compact 4HP all analogue low frequency oscillator with a wide frequency range, voltage control, numerous outputs, reset input and a VCO mode.

LFO speed is set via a manual control and voltage control input. There is a unipolar square wave output along with both bipolar and uni-polar triangle, saw and sine waveform outputs.

When VCO mode is activated, the frequency jumps to audio range and will track V/Oct for approx 5 octaves. A reset input allows the LFO waveform cycle to be reset and produces hard sync functionality in VCO mode.


Technical Specifications

Size: 4HP
Power: +12V 40mA / -12V 20mA
Depth: 32mm (approx)