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 include 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. This production run is limited to 210 modules, due to parts constraints.
specifications
Height: 3U (128.5mm)
Width: 18hp (91.4mm)
Depth w/power cable: 35.6mm
Power: 10-pin Eurorack (49mA from +12V, 34mA from -12V)
Audio Output: 12Vpp (-6V to +6V), 10Hz to 18KHz frequency range
demos
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.
