MATRIXSYNTH: G-STORM ELECTRO GSE 4027 VCO Eurorack Module (ARP 2600, Odyssey) [Demo 1]

Tuesday, May 19, 2020

G-STORM ELECTRO GSE 4027 VCO Eurorack Module (ARP 2600, Odyssey) [Demo 1]

Published on May 19, 2020 gstormelectro

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

Today I am giving an introduction to my new 4027 VCO. The 4027 VCO is a Eurorack adaptation the ARP 2600 VCO-2. Watch your audio levels, especially when the full range of the waveforms are demonstrated.

0:00 Opening Sounds
0:25 Introduction
1:12 Audio
1:31 Euro Adaptation: Bringing That Special Tone To Life
2:09 Front Panel
3:03 Waveforms Audio
5:38 Doubling VCOs, FM
7:25 Outro Sounds: Bass, Lead, Arpeggio

Recorded direct to Tascam DR-05.
KBD control + Sequencing: Beatstep Pro
**Ending Track**
Bass: 4027 VCO | Tonus VCF
Lead/Arpeggio: 4027 VCO | 4023 VCF
Delay: Timefactor"


via G-Strom Electro on Reverb

"The 4027 VCO is a 10HP Eurorack filter adaptation of the colorful VCO-2 tone source from the ARP 2600 synthesizer. You know…that all analog, all discrete components, SAWTOOTH core packed with the SINE, TRIANGLE, and PULSE w/ PWM! If you’re looking for warm, fat analog synthesizer tones – 4027 VCO is the one for you.

In bringing that special tone to life the 4027 VCO keeps the circuit as close to the original as possible: a matched transistor pair, an Interfet premium dual FET can (because that beautiful Sine is worth it), temperature compensation resistor for tuning stability, low ESR styrene oscillation capacitor, 5-NPN monolithic substrate transistor array, precision Tune and Tracking trimmers, and the 70s spec op amps which are still being offered today. The 4027 VCO has requisite LDO voltage conditioning to isolate the oscillator tuning from your systems power rails. While each module is fully tested and calibrated, it may need minor TUNE trimmer correction after warm-up to account for variances in different systems. This limited quantity module is lovingly hand-crafted in the USA.

Waveforms: SINE (-4v to 4v), TRIANGLE (-4v to 4v), SAWTOOTH (0 to 6v), PULSE (0-6v) w/ PWM
Three 30mm throw Illuminated Bourns slide pots - Frequency, Fine Tuning, and Pulse Width
Three 20mm throw Alpha CV slide pots
CV1 input: Wide Frequency Modulation (FM)
CV2 input: Reduced Frequency Modulation (Vibrato, FM)
Keyboard (KBD) V/Oct input.
Multi-turn Trimmers: Tune, Tracking
Single-turn Trimmers: TRI Symmetry + DC Offset, SINE Purity + Gain
CV Frequency Range: C1 –C8 when Initial Freq. is fully decreased
No-Input Freq. Range: 10-550Hz
Slim design makes it skiff/boat-friendly.
Includes a 10-pin to 16-pin Eurorack ribbon connector

4027 VCO Pairs Well With…
GSE 4023 VCF
GSE Spring Tank Reverb Driver
another 4027 VCO
Delta Sound Labs Mobula
10HP Module width
24mm Module depth
78mA on +12V
24mA on -12V
0mA on 5V (not used)"

1 comment:

  1. Seems this one's not really ready for release yet. PWM's all messed up, fixing the centered square is easy one ot two resistors, tops. Poor range while unpatched V/oct is fixable, and should be.
    Kind of a swing and a miss, if you're after an ARP 4027 VCO. ARP-ish maybe.

    Your Xa VCF sounds good. This VCO, not so much. Hope you respin the design and fix the obvious errors.



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