MATRIXSYNTH: Noise Reap Bermuda Eurorack VCO Demo


Friday, December 23, 2016

Noise Reap Bermuda Eurorack VCO Demo


Published on Dec 23, 2016 FatSynthDude

"I made this one with the focus being on the pair of Noise Reap Bermuda's I received today. These are fairly simple triangle-core oscillators with triangle, sine, and pulse wave outputs. What makes them different from other VCO's is that there's a control onboard to route the triangle wave back into the core. It's a simple trick that a lot of oscillators can do already with some self-patching, but it's neat that it's a built-in modulation here with a built-in attenuator. For those that have never tried feeding an oscillator back into itself, this results in distortions in the waveform. It's a trick that a lot of people forget exists, so it's handy to have a dedicated knob for it. The other special feature is the price. These are only $65 each. In my brief experience with them so far, they're fairly stable and track CV very well. I haven't done a side-by-side comparison to my other oscillators yet, but it will be interesting to see how they compete against the more expensive ones. Regardless of how well they compare, I'd say they're worth the phenomenally low price.

So for this composition, the Bermudas handle the bass synth and the lead synth. The Bassier one is ran through the 4075 and the lead goes through the Polivoks filter.

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Uoki-Toki Polivoks Filter
Noise Reap Bermuda (x2)


From Noise Reap:

This is a simple analog VCO. Its “thing” is that the triangle output gets AC coupled back into the triangle core, thus self-frequency-modulating itself. New harmonic content results as the shape of the core becomes less definable. Since everything derives form the triangle core, all the wave outputs get distorted. The videos below demonstrate this.

Furthermore, the self mod control is sensitive to speed of knob rotation. If swept slowly there is no notable change in pitch. If swept not-slowly, the movement of that control will result is a momentary pitch swing. This can be “played” for effect and adds bellow or fluctuation to the pitch. If self-mod starts to near its maximum position, the VCO will go slightly flat. This can be noticed near the end of the sine video.

About the sine output. It’s nowhere near a perfect sine, but it’s pretty sine-ish. It is also inverted relative to the phase of the triangle and square outputs. If the sine is mixed with the other waveshapes (through external patching) this serves to cancel out the fundametal frequency in the other waveshapes, and only the harmonics are left. This has a highpass filtering effect and can make useful tones.

The circuit is well compensated against temperature related pitch drift, and has good 1V/oct tracking. Fine tracking adjustment can be done from the front panel via small flathead jewlers/glasses screwdriver. If overtracking turn left, if undertracking turn right. A blue trimpot on the circuit side of the module adjusts the initial frequency set.

Specifications:

EURORACK 8HP
REVERSE VOLTAGE PROTECTED
SUB TO SUPERSONIC FREQUENCY RANGE
CURRENT DRAW 17MA @ +12V
CURRENT DRAW 17MA @ -12V
MODULE DEPTH 21MM
TRIANGLE OUT 10VPP
SINE OUT 9VPP
SQUARE OUT 10VPP"

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