Synthesis Technology - Eurorack E430

The E430 is a faithful re-creation of the classic Oberheim SEM 12dB/oct state-variable filter with 3 added features:

Individual filter outputs: Low-Pass, Bandpass, Notch, and High-pass
Voltage-controlled Morph output: sweeps between LP-BP-HP or LP-Notch-HP via panel switch
Voltage-controlled Resonance

The original SEM circuitry was not "improved" or updated. Great care was spent through measurements and beta testing to duplicate the SEM's unique sound. The design incorporates 40 year old circuits such as:

LM301 audio input op amp
LM741 resonance op amp
RC4558 audio summing op amps
Discrete JFET current buffers between filter sections
CA3080-class OTAs
No self-resonance unless patched externally

Other features includes 2 FM inputs (FM1 is a reversing attenuator) and user-programmable LED color for the Morph switch (see the video in the DEMO section).

The 18HP wide E430 has a MSRP of $339, which includes FREE domestic shipping. This production run is limited to 210 modules, due to parts constraints.

Analogue Haven will be the exclusive dealer for the E430 for the near future. This may change at a later date.

AVAILABLE FOR PRE-ORDER: Analogue Haven E430 Page

SPECS

Height	3U (128.5mm)
Width	18hp (91.4mm)
Depth w/power cable	35.6mm
Power	10-pin Eurorack (49mA from +12V, 34mA from -12V)
CV input range	10Vpp (-5V to +5V), DC to 8KHz
Audio Input	50K nominal input impedance, 10V pk-pk
Audio Output	12Vpp (-6V to +6V), 10Hz to 18KHz frequency range

PANEL CONTROLS

Frequency	Sets the initial filter frequency
Input 1 & 2	Level knobs for the two audio inputs
Resonance	Sets the initial filter resonance
FM 1 Level	Inverting attenuator for the FM CV inputs
FM 2 Level	Secondary FM in
Filter Morph	Sweeps between LP-selected=HP filter outputs
LED pushbutton	OFF (unlit) - Bandpass is selected for Morph	ON (lit) - Notch is selected for Morph

INPUTS AND OUTPUTS

1V/Oct	1 volt per octave control for the filter frequency
FM 1 and FM 2	Filter frequency modulation
RES	CV input for Resonance
In 1 & 2	Audio signal inputs
LP Out	Lowpass filter output
BP Out	Bandpass filter output
NOTCH Out	Notch filter output
HP Out	Highpass filter output
MORPH Out	Morphing filter output
M CV	Morph CV input

E430 overview by Dave Trenkel

How to re-program the button LED colors on the E430

E430 mono synth (with E330 VCO) by Seth Elgart

6 sections as follows: 1. Modulated modulator plays the notch - chewy nyay-nyah flavor 2. Now compare band pass (both process a Hyperion Spectral Drone) 3. Yes you can play the BP feedback like a self-resonator 4. Basic pad sound from BP feedback 5. Running the BP thru E490 Moog filter and riding the input level, even though there's no external osc! 6. Bit more industrial, using a VCA to rhythmically inject the BP-feedback

Robert Rich demo, using 3 LFOs sweeping Morph, Cutoff and resonance, with variances in the Morph knob and the different BP/Notch switch. Beginning minute or so is with Notch, then BP, then varying in different directions

Robert Rich demo, uses 2 E430s (Left and Right), pushed to the extreme limits. Testing the over-loading, high resonance, audio-rate modulation, you name it. Watch your levels, hide the pets.

Set of 3 demos from Loren Nerell

E430 SEM VCF User Manual availble Dec. 20, 2024

E430

Morphing SVF

SPECS

PANEL CONTROLS

INPUTS AND OUTPUTS