Geranium Production

Something is stirring in the circuit.

HARMONIC 75

An instrument that came from far away. And hasn't finished going further.

Discover
Vintage harmonic synthesizer, the inspiration behind Geranium HARMONIC 75

Heritage

Some sounds never die. They wait.

In the 1970s, a cult additive synthesizer redefined what "harmonic" could mean. Then it left the studios... but never left the memory.

Geranium HARMONIC 75 is certainly not a copy. It grew out of a question: what if it had never stopped evolving?

The two harmonic generators of Geranium HARMONIC 75, sixteen components each

The core

Two generators. Sixteen harmonics each.

Stack them. Detune them. Let them drift into one another until the sound comes alive. Here, harmony isn't picked from a menu : it's sculpted, one slider at a time.

2 generators 32 harmonics Natural drift
The Harmonic LFO of Geranium HARMONIC 75, moving the sixteen components of a generator

The articulation

A timbre that keeps travelling.

Envelopes, two LFOs, a matrix of twenty routes and the keyboard under your hands. And one modulator that exists nowhere else : the Harmonic LFO moves the sixteen faders of a generator while the note is still sounding.

Harmonic LFO 20 routes Mod wheel & aftertouch
The Analog Stage of Geranium HARMONIC 75, with six filter circuits and four slopes

The circuit

Six filters. None of them polite.

State variable, Sallen-Key, two transistor ladders, a diode ladder. Four slopes each, low to high pass, set separately for both generators and for the master. Then drive, clock wander and a little crosstalk, if perfection was getting boring.

6 circuits 6 to 24 dB/oct Analog character
The custom waveform editor of Geranium HARMONIC 75

The lab

Every wave, drawn by hand.

Draw a cycle, load one, invert it, normalise it. Then reach for bit resolution, phase behaviour and the Factory 75 experiments. Nothing is fixed and everything can be shaped.

Custom waveforms Factory 75
The arpeggiator of Geranium HARMONIC 75, with 32 steps, ties and legato bridges

The motion

An arpeggiator that breathes.

Thirty-two steps, each of them a note, a tie or a rest, joined by legato bridges that change the pitch without starting the envelope again. Swing and humanisation on top, so repetition never sounds mechanical.

32 steps Tie & legato
The effects section of Geranium HARMONIC 75: chorus, delay and reverb

The finish

Space, body, character.

Chorus, delay and reverb, designed as an extension of the sound engine rather than a plug-in bolted on the end. Dying Tape leans all the way into worn magnetic tape, wow, flutter and dropouts included.

Chorus Delay Reverb
Geranium HARMONIC 75 icon

Geranium Production

HARMONIC 75

A harmonic synthesizer. An analog / digital renaissance.

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