Ellitone Osage Modular Synthesizer System serial #006

Customer review of EOMSS serial #001:

"-Quite possibly one of the most visually and acoustically beautiful synthesizers ever made. I am truly astonished by it. Buchla-level audio qualities. Trapezoidal envelopes attached to gorgeous VCAs. Wonderful stereo mixer. USB MIDI works without issue and is very easy to configure. The range of sounds that are possible with this setup is baffling. EOMSS is a work of love and art. Ellitone rocks." -Austin J.

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Serial#006

Todays listing is for an EOMSS 4-voice system made with Quarter Sewn Oak, Spalted Maple, and Black Walnut hardwood panels and case:

1x midi to cv interface and stereo mixer module 

1x quad envelope quad vca module
2x dual oscillator dual wavefolder modules

1x SUNRISE style Case

this 4-voice system contains the essential modular functionalities to achieve four independent analog voices (polyphonic) controlled via usb midi 

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-EOMSS is a synthesizer format consisting of unique module dimensions, power distribution, audio signal levels, control voltage levels, and connection jack styles. I will attempt to answer most compatibility questions with these quick stats:

-module dimensions: 164mm X 93mm 

-audio signal levels: 4v peak to peak (-2v/+2v)

-control voltage levels: 0-10V 

-oscillator pitch tracking: 1v/oct

-connections: control voltages (banana jack) audio inputs/outputs (3.5mm mono)

-usb midi input 

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-includes case power module, 5 pin power cable, 12v meanwell wall adapter
-does NOT include banana or audio cables.

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DUAL OSCILLATOR DUAL WAVEFOLDER MODULE

-two vintage analog oscillator designs based on the buchla 258 circuit, each with its own dedicated wavefolder based on the buchla 259 timbre section. 

-the 258 circuit was chosen because of its fat wave shapes and excellent audio fm characteristics. These oscillators offer tones ranging from sweet and delicate to pure chaos when fm audio modulation is introduced. 

-oscillators are calibrated to track pitch at 1v/oct. Modern matched transistor pair IC chips allow these oscillators to play in tune across 5-6 musical octaves with minimal drift over time. I am very happy with the performance! 

-the dedicated wavefolder circuit on each oscillator takes the triangle waveform output and transforms it into a harmonically rich and complex variable wave shape controlled by knob or cv input 

each oscillator has three audio outputs: 

-(left osc) sine to square. (right osc) sine to saw 

-triangle  

-wavefolded triangle out

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-oscillator frequency, wavefolder amount, and wave shape are all voltage controllable with an input range of 0-10V

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MIDI TO CV INTERFACE AND STEREO MIXER MODULE

-incoming usb midi messages are converted into polyphonic control voltage outputs for note values, note on/off gates, cc/pitchbend, and velocity data 

-select “OSAGE MIDI2CV” as midi output device in your DAW

-use the BUS SELECT, PARAMETER INCREASE, MIDI CH/CC buttons to assign each of the four busses (A,B,C,D) a midi channel (1-16) and midi cc# (0-99)

-while multiple busses (A,B,C,D) are assigned to the same midi channel, these outputs become polyphonic. Incoming midi note messages will be parsed between the channels, one after the other.  

-press the MIDI CH/CC button until display reads “CC” to assign a CC# for each bus. the default value [00] for CC corresponds to the PITCHBEND midi value. Unlike regular CC messages with a resolution of 127 steps, the PITCHBEND midi value has a much higher resolution of 16,384 steps, this is why it is the default selection. Both CC and PITCHBEND values will be output as a control voltage level of (0-10V) 

-the stereo panning audio mixer section offers four high quality, digitally controlled analog channels of audio input and summing. some might consider it an overkill to use a specialized quad VCA chip, controlled by DACs and microcontroller to achieve a simple four channel audio mixer. But this approach was necessary to obtain true channel separation and avoid audio bleed between channels, this also allows for direct control of channel volumes by incoming velocity midi data. 

-MIDI VELOCITY ENABLE button while active will override the positions of the audio level sliders and set channel volumes according to values of incoming velocity midi data. 

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QUAD ENVELOPE QUAD VCA MODULE

-four VCA channels controlled by four internal Envelope Generators. 

-each of the four channels consist of: audio input, audio output, envelope gate input, envelope cv output (0-10V)

-select which VCA/Envelope channel to edit using the channel select button. While a channel is selected, its envelope attack time, decay time, and vca offset values are displayed as a ring of lights circling each of the encoder knobs. 

-pressing the VCA/Envelope channel select button until the fifth position will activate all four channel lights. This indicates that all four channels of Envelope and VCA settings are now being edited at once. This poly mode allows for easy editing of all envelopes during a multi-voice performance. 

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