gstormelecto XaVCF Oberheim OB-Xa Eurorack Filter Module

gstormelecto XaVCF Test Filter Circuit [Audio Only Demo]

Published on Feb 16, 2020 gstormelectro

"Audio and Video by G-Storm Electro c. 2020

I've been getting requests for demos of my upcoming XaVCF module.
It will be a eurorack adaptation of the OB-Xa filter.
More info at https://www.modulargrid.net/e/g-storm...
You know this sound from Rush Tom Sawyer and Van Halen's album 1984.
While we're all eagerly awaiting the module prototype I thought
I would share a brief sampling from a mini-lab test circuit.
A more thorough overview of the module will happen when it gets built.
So be on the lookout for that one in the near future.

The XaVCF will sound pretty far out.
We're talking about full on intergalactic blast off here.
Headphones recommended. BUT!...
Watch your levels, thick resonant sweeps ahead!
Prepare for ignition...
3...
2...
1...

Timestamps
0:00 Classic 2-Pole resonant drop sweep
0:16 4-Pole Resonant Riser
0:41 2-Pole pure self-oscillation sweep w/ tracking
0:56 ...add both VCOs back in, slow sweep through sweet spots
1:40 2-Pole pure self-oscillation musical sequence
2:05 1-Pole Bandpass LFO modulated

VCOs: 101-VCF, Pittsburgh Synthesizer Box
LFO: Batumi
Delay: Timefactor
Sequencing/Control: Beatstep Pro
No mastering, no eq, nor additional post-effects added."

"The XaVCF is a faithful adaptation of the OB-Xa filter in Eurorack with added features.

As with the original, the XaVCF has two filter circuits to choose from! The heart of both designs having each its own Alfa reissue AS3320 chip. The XaVCF has the original Modes: a 4-Pole standard Lowpass circuit, and a 2-Pole Lowpass derived from a State-Variable circuit. Additionally there are 1-Pole Bandpass and Lowpass modes not available on the original!

Both filter circuits on the XaVCF not only have musical self-oscillating resonance w/ CV control, but the frequency cutoff can be tracked V/Oct using the CV2 input jack. In this way the XaVCF can be used as a sine wave oscillator. Unlike some older classic filter designs, the XaVCF retains a lot of low end at higher resonance.

The XaVCF is drenched in that fat and creamy wall of sound you’ll not soon forget. Are you ready for the Xa experience?

FEATURES
* Two selectable filter circuit configuration Types: Type I-SVF 2-Pole Lowpass, and Type II 4-Pole Lowpass.
* Additional Modes: Type I 1-Pole Bandpass, Type II 1-Pole Lowpass
* Two voltage controlled input jacks for Frequency CUTOFF w/ signal attenuators. CV1 is an extended range input capable of providing some boost to weaker control signals. The CV2 input will track V/Oct when its pot is fully CW.
* A voltage controlled input jack for RESONANCE w/ a signal attenuator CV3.
* Two audio signal input jacks w/ individual attenuators. Above midpoint, these inputs can overdrive the filter from most Eurorack oscillators and audio sources. This is especially useful in Bandpass Mode to compensate its weaker audio output signal.

Available late February 2020
Be sure to check out my other cool modules in my Reverb Store"

CUSTOM ROLAND MJX-70 with Blue Keys and Custom Graphics

Note: links to listings are affiliate links for which the site may be compensated.

via this auction

Update: you can see it featured in a video posted here.

"This synth is a serviced, repaired, customized JX8P.
It is in decent working order now.
Decent used condition - See photos
Photos are of the actual synth you will receive!
It originally was in very ugly cosmetic shape and used to be a 220v version. It is now 110-120v (US standard)
The internal power supply has been serviced and setup to operate on 110-120v (Unites States standard) and is a factory Roland power supply for US use.
The synth has new custom wrap with new graphics made to match with Roland's look/theme used from around 1986 thru the 1990's.
This will also match the graphics of the Retroakiv MPG70 Controller which, if you have one, can also be used with this synth.
The synth was missing 17 keys when I got it, all have been replaced and tested with brand new BLUE 3d printed keys.
The black keys are factory originals.
The 1/4 audio jacks on the back are brand new gold replacements and they all work but as in most JX8P's they don't fit right, this is
a problem I have seen in every JX8p I have encountered. My patch cords (cheap rubber hose type) plug in fine and work, but other patch cords might give you a little trouble.
The 2 pin Roland power jack on the back has been upgraded to the industry standard 3 pin IEC type, no more
hunting around for the 2 pin Roland power cord! This gives it a proper ground connection too by just simply plugging it in!

I have owned this one for 10 years now, I am selling it because I rarely use it and to raise money to add other gear to my studio..."

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Sequential Circuits Prophet T8

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via this auction

Rare EMS Polysynthi in the background.

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Osage Vector Synthesizer #1

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via this auction

You can find a demo of one posted here.

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RSF Kobol Expander II Analog Synth SN 13391

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via this auction

"Legendary monosynth much sought after admired for its bass sounds and percussive tones...a real masterpiece by Ruben and Serge Fernandez. Described as the French Minimoog this is something to rival the more common sounds offering much more variety. There have been fewer than 200 hand made from '79 and this particular one is in superb condition. Kept in a smoke free studio its entire life anyone looking for something collectable and mint will appreciate this for years to come."

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Ludwig Phase II Guitar Synthesizer With Original Brochure

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via this auction

"Ludwig Phase II Guitar Synthesizer vintage excellent condition even the rubber feet. There are a few scratches. There is a dent at the bottom back corner as seen in photo. Please view all 12 photos. I also have the original (not a copy) sales brochure from 1970. I am the original owner. It has never been opened or modified. I lost the original handle and had the one you see in the photos made. I don't think I played more than 10 times since I bought it in 1970. Everything works including all the lights. This is one of the rarest fx pedals. Supposedly only 150 were made."

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ARP Omni-2 SN 1144

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via this auction

"This is an ARP Omni 2, Model 2473, completely refurbished to full functionality by Synthcave Sound. The restoration consisted of 40+ hours of work:

- All 15 sliders were replaced with brand-new, modern, LED-illuminated sliders; these are super-smooth and look fantastic!

- All tantalum and electrolytic capacitors in the power supply have been replaced with new high-voltage electrolytic capacitors - additionally, the recommended power-supply mod as described in ARP's field change notice FCN0011 (addition of a pair of capacitors and a pair of zener diodes) has been performed

- New key bushings on all keys, bussbar cleaned, and the keybed leveled; all keys were individually cleaned and polished

- All pushbutton contacts were cleaned

- All tantalum capacitors throughout the synth have been replaced with new electrolytics

- The 4075 VCF module has been modded for improved cutoff range

- Full calibration according to the service manual."

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Rare Synare 3 Drum Synth Clone by Ladik.eu

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via this auction

"Rare Synare 3 'UFO' Drum Synth Clone by Ladik.eu in lurid kelly green, a faithful recreation with super solid construction made in the Czech Republic. As used by Joy Division on She's Lost Control and Ultravox on Vienna, also commonly used in dub soundsystems.

Two tunable oscillators and a lowpass filter, capable of self resonance, one oscillator switchable to be a noise generator, one oscillator can be set to modulate the filter frequency for wild metallic FM sounds with high resonance settings. Can be triggered by hitting the pad with a drumstick or sending a trigger sound, with velocity (just send quieter or louder clicks), into the trigger input for more precise timing.

The foam drum pad is slightly dinged in places but everything works as new. Have fitted three foam feet to the base for more stable tabletop use."

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E-MU MP-7 Command Station

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via this auction

"Near mint condition MP-7 with original sound rom, the pads, lights, knobs, encoders, buttons all working great, LCD is bright and clear. Has USB port. Sound is great. Old school beats and all the synthesis to produce music. Comes with road case and original plastic sides. Rpad case is used with some lightscratches on the side but the case hardware is in great shape."

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Vector Sequencer Review FINAL

Published on Feb 16, 2020 loopop

http://www.five12.com

TIMELINE
0:00 Intro
0:45 Overview
2:00 Inputs and outputs
3:00 The basic workflow
5:05 Sequencing
8:00 Lane types
11:40 Sequence controls
13:40 Chord parts
15:25 Drum parts
16:40 Chance ops
18:50 Sequence ops
23:00 Sub sequencers
27:15 CV mods
28:20 Playlists
29:25 Dashboard
30:00 Pros & cons