Yamaha E-75 Son Of GX modification

Posted by in mods & repairs, Studio

Got this organ with guts from the infamous GX-1 and the CS80.

After the modification we got full access to the 2 polysynths (7 voices 2 OSC and LP+HP filter each) and the monophonic bass synth.

3 times 16 controls in total:

4 Filter controls (Low pass filter frequency, Low resonance, High pass filter frequency, High pass resonance)

5 stage Filter Envelope Generator (Initial Level, Attack level, Attack, Decay, Release)

4 stage Voltage Controlled Amplifier Envelope Generator (Attack, Decay, Release, Sustain)

3 waveforms possible for use in parallel (saw, square, narrow pulse)

CV-control for LPF and VCA for each manual. LFO and sequencer control possible:)

Speed control for the triple chorus + Input and different outputs.

Curetronic shape LFO now included

duration: 5 days

IMG_5014 IMG_5016 IMG_5017 IMG_5021 IMG_5023 IMG_5033 IMG_5034 IMG_5035 IMG_5036 IMG_5038 IMG_5039 IMG_5040 IMG_5054

 IMG_5056 IMG_5059 IMG_5061

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Thx to Marc Brassé for his priceless and comprehensive guide! Foto by www.jacobstoy.de

more info here:

http://www.brassee.com/files/How_to_build_your_own_Son_Of_GX_complete.pdf

http://www.skerjanc.de/E-75.htm