earlier_designs | gotharman.dk

Projects

Gotharman working on the microGothar firmware so many, many years ago...

Touch TuuL 32hp eurorack module with sampling

4 channels which can each be:

-Oscillator/Sampler/LFO

-Dual filter/Vowel filter

-Effects processor

-Voltage controlled Mixer

Each channel also has one utility function:

-Draw Wave Modulator

-Step Sequencer

-Touch Screen Keyboard

These are based on our best selling filter board VCF2, with some improvements:

-24db LPF an BPF modes have been added.

-Filter type can be set for both filters in a group.

-Resonance can self-oscillate.

-These filters are more unstable than the other Zaturn filter types, which makes the filter tuning less precise. Therefore these filters might not be ideal for polyphonic stuff.

Specs:

-2 analog filters in each group (8 in total).

-Each filter can be set in 12db LPF, 12db BPF, 12db HPF, 24db LPF and 24db BPF modes.

-Self-oscillating resonance.

-With input levels set higher than 100, the filters will drive.

-Analog distortion can be switched on/off. Drive is set via the input level.

Multi Filters

These are based on the SSI2140 filter chip, and has the same character as the VCF10 filter board. Each filter group has a lowpass filter with selectable slope (6, 12, 18 and 24 db), and a switchable 12db bandpass/highpass filter per voice. When bandpass is selected, the LPF and BPF runs in parallel. When highpass is selected, the HPF goes into the LPF in serial.

Original Zaturn Filters

Newly engineered 12 db dual self-resonating analog filters per voice, with a special character, arranged as LPF and BPF in parallel to each other

EuroBoard MkII

Eurorack module for LD3 filter boards.
-14 hp
-Polarity for each parameter can be set with jumpers
-Solidly build with metal potentiometers

Urano VCF51

Urano dual 12db analog LPF filter board.

Parameters:
Cut: Filter cutoff frequency.
Reso: Filter resonance.
Drv: Filter Drive On/Off

Urano VCF52

Urano dual 24db analog multi mode and LPF
filter board.

Parameters:
Cut: Filter cutoff frequency.
Reso: Filter resonance.
Type: Filter Type (Only VCF1)(8 types).

Dual SSI2140 VCF for Tiny LD

-2 separate analog multimode filters, that can each be assigned to their own Audio Bus.
-Based on the great new SSI2140 filter chip, which is based on the great SSM2040!
-25 filter types.
-Program your own filter types.
-Morphing between filter types.

Each of the filters has 4 filter blocks. By combining these blocks, using VCA’s, it is possible to obtain a number of different filter modes.
It comes with 25 pre-programmed filter types, but it is also possible to adjust these, to obtain an even wider range of filter types.
If different filter types are selected for morph layer A and B, it will morph between the filter types.

Parameters (One set of parameters for each of the two filters):
Cut: Filter cutoff frequency.
Reso: Filter resonance.

Inp: Filter input level.
Type: Pre-programmed filter type select.
Adj1-4: Adjusts the levels of each of the 4 filter blocks. Use these to create your own filter types.

VCF13 -Diode Drive Filter

Unique dual analog diode drive filter!

Filter A can be switched between 12 and 24 db low pass modes, while filter B can be switched between HPF and BPF.
The Diode Drive can be switched on and off.
Filter A outputs to Out1 and Filter B outputs to Out2.
Cutoff frequency and resonance can be adjusted and modulated separately for each filter.

Parameters:
CutA: Filter A cutoff frequency.
CutB: Filter B cutoff frequency.
ResoA: Filter A resonance.
ResoB: Filter B resonance.
VcfA: Filter A 12db/24db LPF modes.
VcfB: Filter B BPF/HPF modes.

VcfAB: Mix between filter A and B.

VCF12 -FilterBank

Five band variable analog filterbank!

One low pass filter, one high pass filter and three band pass filters.
It is possible to adjust cutoff frequency offsets, the gap between the filter cutoffs and resonance.
When adjusting the gap between the cutoff frequencies, using theSpreadparameter, the LPF will have the lowest cutoff frequency, BPF1 the next lowest, then BPF2 and BPF3, and HPFwill have the highest cutoff frequency.

Parameters:

The Offset1 parameter sets the cutoff offset for the LPF, BPF2 (the middle BPF) and the HPF.
The Offset2 parameter sets the cutoff offset for BPF1 and BPF3.
The LPF and BPF2 are always outputted to Out1.
BPF3 is always outputted to Out2.
BPF1 and the HPF can be switched to output to Out1 or Out2.

Out1/2: Mix between Out 1 and 2.

VCF10 -Dual SSI2140 Filter

Dual analog filter based on the SSI2140 filter chip. It has one multi mode filter (LPF1, LPF2, LPF3, LPF4, BPF, HPF, Notch, AllPass) and one band pass filter.
Cutoff and resonance can be adjusted and modulated separately for each filter. It is possible to set and modulate the mix between the two filters.

Parameters:
Cut: Multimode Filter cutoff frequency.
CutB: Bandpass Filter cutoff frequency.
Reso: Multimode Filter resonance.
ResoB: Bandpass Filter resonance.
Type: Sets the multimode filter type (8 types).
BPF: Mix between the multimode filter and the bandpass filter.

VCF11 -Dual Zaturn Filter

The unique Zaturn filter available as a filter board!

Dual analog filter with a unique character, based around the SSI2140 and SSI2164 chips. Each of the 2 filters can be switched between low pass and band pass modes.
Cutoff and resonance can be adjusted and modulated separately for each filter. It is possible to set and modulate the mix between the two filters.
Via a jumper, it is possible to set this filter up as 2 separate filters, for duo filter action on Urano.

Parameters:
CutA: Filter A cutoff frequency.
CutB: Filter B cutoff frequency.
ResoA: Filter A resonance.
ResoB: Filter B resonance.
BPFA: Filter A LPF (Off) or BPF (On) modes.
BPFB: Filter B LPF (Off) or BPF (On) modes.

MixAB: Mix between filter A and B.

VCF14 -Transistor Ladder Filter

With low frequency gain compensation and a unique drive curcuit!

Made with highend THAT matched transistors.
Has low frequency gain compensation for high resonance settings, which can be adjusted and modulated.
Comes with a special drive circuit, which can be driven into distortion. This can also be adjusted and modulated.
Cutoff frequency and resonance can be adjusted and modulated as well.
Filter output 1 can be switched between 12 and 24 db low pass modes, while filter output 2 can be switched between 6 and 18 db low pass modes. By modulating the filter output mix, it is possible to crossfade between filter modes, and by inverting output 2 and mixing it with output 1, it is possible to create new filter modes.

Parameters:
Cut: Filter cutoff frequency.
Drive: Filter Feedback Drive.
Reso: Filter resonance.
Comp: Low frequency gain compensation.
Out1: Output 1 12db/24db LPF modes.
Out2: Output 2 6db/18db LPF modes.

Out1/2: Mix between output 1 and 2.

VCF7 -Tubaz

Tube filter with characteristic fat, warm and distorted tube filter sound. Lowpass, bandpass and highpass modes are available.

Output 1 is switchable between lowpass and bandpass modes, output 2 is always in highpass mode. The Out1/2 control mixes between LPF/BPF and HPF. It also has negative analog feedback, that can make it sound thinner.

Parameters:
Cut: Filter cutoff frequency.
Reso: Filter resonance.
Cut3/Feed: Negative feedback.
Out1: BPF or LPF select.
Out2: Always HPF.
Out1/2: Mix between filter output 1 (BPF/LPF) and filter output 2 (HPF).

VCF5 -MiniProphet Filter

Based on the CEM3328 filter chip. 4 different lowpass slopes can be selected and mixed to create other filter modes.

Parameters:
Cut: Filter cutoff frequency.
Reso: Filter resonance.
LPF1: Switches filter output 1 between 24dB and 12dB steepness.
18dB: Switches the 18dB lowpass block on filter output 2 on or off. The phase of this is inverted compared to the phase of the 12 and 24 dB outputs on output 1, so when mixing with these, different filter modes can be obtained.
6dB: Switches the 6dB lowpass block on filter output 2 on or off. The phase of this is inverted compared to the phase of the 12 and 24 dB outputs on output 1, so when mixing with these, different filter modes can be obtained.
Out1/2: Mixes between the filter outputs 1 (12dB/24dB) and 2 (Inversed 6dB/18dB).

-Granular workstation.

Has been replaced by Little deFormer Zero.

Little deFormer 3 MkII

Little deFormer Zero

Tiny LD MkII

-Granular workstation.

Has been replaced by Little deFormer Zero.

Little deFormer Zero

Zaturn

-Modular synthesizer with memory (1024 preset/song locations/64 favorite sounds.

Has been replaced by Zaturn Zero.

Zaturn Zero

PolySpaze MkII

4 voice polyphonic/multi-timbral synthesizer/sampler with analog filters, granular effects and sequencer.
-Stereo in and out.
-Morphing.

User Manual

SpazeDrum Blue

Still available as "Blue In Black"!

Analog drum synthesizer with 16 parts / 8 voices (4 analog/4 digital), based on dual SSI2144's.
-Each part can be configured as an analog drum sound or a digital synth/sampler with or without 2 analog filters.
-2 filters and 2 insert effects per part.
-2 output effects.
-Sample wav import (18 minutes/2047 samples).
-Sequencer with 16 note tracks and 64 knob tracks.
-64 random generators, 16 LFO's.
-Stereo out.
-Morphing.
-Optional analog outputs option.

User Manual

Anamono Xmini

Modular synthesizer with memory, exchangable analog filter, sampler, sequencer and granular effects.
-Audio in and out.
-Morphing.

User Manual

Zybraz

24 note polyphonic synthesizer.
-2 parts.
-Resonator oscillators, filters and effects.
-Morphable waveforms sine>tri>saw>squ>feed.
-Noise generator.
-8 filter types.
-8 effect types.
-2 envelopes and 2 lfo's per part.
-SOLID! Made only with high quality parts.

FX deFormer

Granular effects processor with sampler, sequencer and line/guitar input.
-Granular effects derived from Little deFormer 2
-Monophonic sampler
-10 minutes of sampling time
-512 presets

User Manual

SpazeBoard6 for LD3

Alternative firmware/analog board for LD3.
-6 monophonic parts with 2 oscillators (1 can play back samples), ring modulator, 2 analog filters (HPF+LPF), 1 digital filter, 2 insert effects, 1 VCA, 3 envelopes and 4 random generators.
-2 monophonic parts with 1 oscillator (can play back samples), 1 digital filter, 1 VCA, 3 envelopes and 4 random generators.
-8 parts for controlling external MIDI gear.
-16 global LFO's and 8 global LFO-trigged random generators.
-2 output effect processors.

User Manual

EuroBoard

Eurorack module for The Anamono X series analog FilterBoards. It is easy to replace the filterboard, to get new flavours in your eurorack. You don't need to own an Anamono X /Xmini for this to work in your Eurorack, but you must own a FilterBoard to install in it. These can be ordered below on this site.

If you order any FilterBoard together with a EuroBoard, this will, of course, be installed in EuroBoard before shipping.

Size: 22hp. Current draw: Up to 100mA, depending on filterboard.

duoSpaze

4 part duophonic/multi-timbral synthesizer/sampler with analog filters, granular effects and sequencer.
-Stereo in and out.
-Morphing.
-Filters and effects in Audio Matrix

Anamono X

Modular synthesizer with memory, 2 exchangable analog filters, sampler, sequencer and granular effects.
-Mono in, stereo out.
-Morphing.

User Manual

PolySpaze Model B

4 voice polyphonic/multi-timbral synthesizer/sampler with analog and digital filters, granular effects and sequencer.
-Stereo in and out.
-Morphing.

User Manual

Fuzion

Music Workstation with sequencer, synthesizers, samplers and granular effects.
-16 track MIDI sequencer with up to 8 audio tracks
-8 Synths/Samplers/percussion oscillators/resonators
-10 effects processors
-2x audio in, 4x audio out
-2x MIDI IN, 2x MIDI OUT
-8 note polyphonic synthesizer / 128 note polyphonic sequencer
-300 minutes of sampling time, max 6.144 samplings

User Manual

Little deFormer 2

Granular workstation with sampler, synth, effects processor and sequencer

User Manual

Biggar deForma custom design

Little deFormer 1 Special Edition

Little deFormer 1

The first deFormer prototype

Anamono Synthesizer

-Monophonic analogue feedback synthesizer with build in granulator/delay effects.

-2 oscillators with waveforms morphable from sine to triangle to saw to square to noise and with osc sync.

-2 analogue filters - 1 multimode (lpf, bpf, hpf) and 1 bpf.

-1 digital multimode filter.

-New Gotharman engineered analogue feedback circuit with g-RAY - NEW sound creating possibilities.

-Analogue VCA and overdrive - fully controllable.

-Fully programable and controllable 16-step step granulator - Delay/granulator times up to 1.5 second.

-Ring modulator, that can process both internal sounds and sound coming via the external audio input.

-External audio input lets you process any sound with Anamono's filters, g-RAY feedback circuit, granulator/delay, ringmodulator and analogue overdrive.

-2 envelopes and 2 step-modulators, all having 2 sets of settings, that can be morphed between, using any modulation source.

-2 LFO's with morphable waveforms and key-sync.

-256 preset memory locations.

-All parameters controlable with MIDI NRPN numbers - Many direct with MIDI controller.

User Manual

deMOON Synthesizer

4-note polyphonic Oscillators with continuously variable waveforms, wave-shape modulation, fm and pwm which works on all waveforms.
4 high quality unique sounding analog-modelled bpf/lpf/hpf/bpf8/add filters.
Granulator effect.
5 distortion types.
4 LFO's with continuously variable waveforms, waveshape modulation and rate modulation.
2 envelopes.
Filter random generator.
Various control sources for every parameter.
Note randomizer.
32-step step sequencer which is MIDI-syncable, has one note track, one velocity track and one controller track, has realtime transpose, and a keyboard (arpeggiator) mode, in which, you can gate and transpose the sequence via a connected MIDI-keyboard.
Storage of 128 sounds and sequences in eeproms. No need to worry about changing back-up batteries.
Direct MIDI-control of most parameters. Writes parameter name and value in display.
Boxed small and compact - easily portable.

User Manual

deMOON first edition

DIY deMOON's

Biggar deMOON prototype

miniProphet Synthesizer

-Completely analogue - no memory!

-Monophonic

-Build in MIDI interface that receives note on/off, velocity, pitchbender and modulation wheel data. Filter cutoff can be controlled by mod wheel or velocity.

-2 VCO's with sawtooth, triangle and square waveforms, pwm, sync and FM.

-2 filters, both LPF, one original Pro One filter and one Ensoniq Mirage filter. Has filter FM (Fxm). The outputs of the 2 filters are phase inversed to each other, to make it possible to do BPF effects.

-2 ADSR envelopes.

-2 LFO's

-Analogue feedback.

-Portamento.

-Power: 230Vac.

-Connections:

-MIDI in

-Audio out

miniProphet Eurorack

Vothar8

microVothar synthesizer

microGothar Duo synthesizer

microGothar 2 synthesizer

microGothar synthesizer

2 Oscillators with sync, fm, ringmodulator and pwm which works on all their 16 waveforms.
2 high quality unique sounding analog lpf/hpf filters.
Overkill distortion.
5 loop envelopes.
2 random generators.
Velocity control of filter cutoff and final amp level.
16-step step sequencer which is MIDI-syncable, is able to control 2 selectable parameters, has realtime transpose, and a keyboard (arpeggiator) mode, in which, you start/stop and transpose the sequence via a connected MIDI-keyboard.
Storage of 256 sounds and sequences in Microchip 24LC256 eeproms, which is guaranteed to retain data for at least 200 years! No need to worry about changing back-up batteries.
MIDI-control of 15 parameters.
Boxed small and compact � easily portable.

microGothar synthesizer Black

Space Eagle synthesizer

Audio demo

-2 oscillators with each 16 different waveforms, which are all affected by pwm. Pitchable noise. Oscillator sync, FM and ringmodulator. Portamento.

-4 x 24db lowpass ANALOGUE filters connected in parallel to each other. Each filter can be separately controlled, programmed and modulated. Possibility of inverting the output of 2 of the filters by 180 degrees, to create new strange sound-effects. Front panel controls: Filter 1-4 cutoff, reso, modulation source 1 amount, modulation source 2 amount, filter output levels. The external audio input pictured, was never activated, so it doesn't work.

-Modulation sources: Oscillator 2 can modulate oscillator 1 (FM) and the 4 filters (FxM). Other sources are: modulator1 (a 16 step step-modulator with glides and steps), modulator2 (a 16 step step-modulator with glides and steps), LFO1, LFO2, random generator 1, random generator 2, keyboard, velocity, midi-controller 1-17, 1 ADSR VCA envelope.

-Memory: 256 locations for storing sounds in EEPROM's - No back-up battery needed. All parameters can be edited and stored.

-MIDI data received (on selectable midi-channel): Note-on, Note-off, velocity, pitch-bend, controller 1-17.

Spaze Jupiter synthesizer

Audio demo 1

Audio demo 2

Duophonic Roland Jupiter-8 clone, build with original Roland IR3109 filter chips, and with a few extra's:

-Hi-Pass has added resonance, and can be modulated.

-Fully programable overdrive stage has been added to it's output section. This can also be modulated.

-Oscillators has some added Gotharman waveforms (16 in all).

EACH VOICE HAS:

-Key modes: Duo, split, dual, mono.

-2 oscillators with each 16 different waveforms, which are all affected by pwm. Pitchable noise. Oscillator sync, FM and ringmodulator. Portamento.

-One 12 dB hi-pass and one 24 dB low-pass (Original Roland Jupiter-8). Each filter can be separately controlled, programmed and modulated. Hi-pass has added resonance, compared to the original Jupiter-8.

-Original Jupiter-8 VCA stage build with Roland BA662's. It can be modulated and an overdive stage are added to it, which also can be modulated.

-Modulation sources: Oscillator 2 can modulate oscillator 1 (FM) and the filters (FxM). Other sources are: modulator1 (a 16 step step-modulator with glides and steps), LFO1, random generator, keyboard, velocity, midi-controller 1-17, 1 ADSR VCA envelope.

-Memory: 512 locations for storing sounds in EEPROM's - No back-up battery needed. All parameters can be edited and stored.

-MIDI data received (on selectable midi-channel): Note-on, Note-off, velocity, pitch-bend, controller 1-17.