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The mk4 builds on the previous mk3 and adds these new features:

- a dot matrix display, making menu navigation, parameter selection etc. a breeze.

- a front panel accessible MicroSD card slot.

- compatibility with the Macro Machines Storage Strip.

- an internal precision clock allowing new algorithms such as a tuner, and pitch and frequency references.

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The new version is largely software-compatible with the mk3, and the intention is to continue releasing new features for both the mk3 and mk4 in parallel.


X & Y inputs, A & B outputs:


ADC: 24 bit, THD+N -93dB, Dynamic range 99dB, SNR 99dB

DAC: 24 bit, THD+N -94dB, Dynamic range 105dB, SNR 104dB

Sample rate: 75kHz

Z input sample rate: 75kHz

CPU: Microchip PIC32MX at up to 50MHz, hackable, open source code framework available.



There are currently 5 'banks' of algorithms. The first 16 ('classic disting') are:


Precision Adder with integer voltage offsets

Four Quadrant Multiplier with integer multiply/divide

Full-wave Rectifier


Linear/Exponential Converter

Comparator with adjustable hysteresis

Sample and Hold with noise source and adjustable slew rate

Slew Rate Limiter with linear and exponential slew

Quantizer with selectable scales

Pitch and Envelope Tracker

Dual Waveshaper - wavefolder and triangle-to-sine shaper

Clockable Delay/Echo

LFO with through zero frequency control and waveshaping

Clockable LFO with multiply/divide and waveshaping

VCO with linear FM sine and saw outputs

VCO with waveshaping (saw/triangle and pulse outputs)

The second bank contains:


Precision Adder with fractional voltage offsets

Resonator for drum synthesis

LP/HP Filter

LP/BP Filter

BP/HP Filter

BP/Notch Filter

State Variable Filter (smoothly variable filter type)

Voltage Controlled Delay Line (vibrato/chorus/flange effects)

Tape Delay with voltage controlled tape speed

Clockable Ping Pong Delay (with or without with input pan control)

Vocoder (12 band)

Phaser (up to 10 stages)

Bit Crusher

The third bank contains:


Single and Dual AR Envelopes (with or without push)

AR Envelope & VCA (with or without push)

Clockable AD Envelope (with mute, gate or trigger)

Clockable AD Envelope & VCA

Shift Register Random CVs

Shift Register Random Quantized CVs

Shift Register Random Triggers (single or dual)

The fourth and fifth banks contain:


ES-1 and ES-2 Emulation

Pitch Reference

Frequency Reference



Audio Playback (16 bit WAV, mono or stereo)

Clocked Audio Playback

Audio Playback with V/Oct, Z Speed or End CV

MIDI File Playback (Clocked or Free Running)

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