MATRIXSYNTH: Greg Surges


Showing posts with label Greg Surges. Show all posts
Showing posts with label Greg Surges. Show all posts

Sunday, April 17, 2022

Tabula Rasa Waveform Editor Demo


video upload by O.Z. Hall

"Shout out to Greg Surges for creating this fun program over 10 years ago!

Open Source location for the Tabula Rasa 8-bit Wavetable Digital Oscillator
https://github.com/surgesg/tabulaRasa

Windows program for managing wave banks
https://github.com/surgesg/tabulaRasa...

FYI, panels, pcbs and full kits may be available from SynthCube.com ( I'm not compensated for this link ):
https://synthcube.com/cart/tabula-ras..."

Monday, July 29, 2013

Tangled Wires, Vol. 2


Published on Jul 29, 2013 Clarke Robinson·6 videos

"Self-running patch on a Eurorack modular synthesizer."

Tuesday, June 18, 2013

Tabula Rasa • Hybrid Wavetable Oscillator + SD Card

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

via this auction

"Tabula rasa is an awesome design pf Greg Surges.
You can make your own wavetables, then just put them on an SD card and the module is ready to go.

It's a DIY built but both PCB and panel are professionally manufactured.
SD card with a set of wavetables is included."

Tuesday, December 18, 2012

New Greg Surges TabulaRasa Fundraiser

Greg Surges has a new fundraiser for the TabulaRasa.  You'll find links to videos there also captured in previous posts via the Greg Surges label at the bottom of this post.  The following is the description captured for the archives.

"The tabulaRasa is a digital wavetable oscillator with voltage control of frequency, waveform selection, and the amount of interpolation between waveforms. The tabulaRasa consists of two components: a hardware synthesis module which can integrate into a modular synth system, and a software application which allows the user to create their own custom waveforms. These waveforms are then transferred from the computer to the tabulaRasa module through a standard SD card slot. A wavetable oscillator is a standard technique in computer music. The oscillator uses a counter (ramp wave) to read a memory array. The array is filled with pre-computed samples of the desired waveform. The memory index being read increases with the counter, and resets when it reaches the end of the array.

The tabulaRasa hardware module has three potentiometers and three control voltage inputs for each of the control parameters (frequency, waveform selection, and interpolation). The control voltage inputs expect a voltage range of +/- 5V, and the board requires a +/- 12V power supply. The potentiometer for each setting selects a midpoint from which the corresponding voltage input diverges.

The tabulaRasa software application allows users to create waveforms in three distinct ways: through manipulating breakpoints to set sample amplitudes, adjusting the strength of various harmonics, or by loading audio samples.

The first method, manipulation of breakpoints, allows the user to adjust 16 breakpoints of a waveform. Each breakpoint is represented by a slider, which can be raised or lowered with the mouse. The points between those breakpoints are interpolated, and there are six user-selectable interpolation types: linear, sigmoid, cosine, circular, exponential, and “Decimated" (a simulated bit reduction algorithm).

The harmonic method uses the same sliders as the breakpoint method, but instead uses the sliders to represent the amplitudes of 16 harmonically-related sine waves. From left to right, the sliders climb the harmonic series, and a harmonic will become more prominent as its slider is raised from the bottom of the screen. The waveform which results from these mixed waveforms is displayed.

Finally, using the “Load Sample” option, the user is presented with a file dialog box from which a short audio file can be selected. The Adventure Kid Waveform pack works perfectly, and is made up of 4300 free single-cycle waveforms.

Note: This fundraiser is for PCB/Microcontroller sets only, not complete kits."



Wednesday, May 30, 2012

pucktronix tabulaRasa test 040412

tabulaRasa test 040412 by greg davis
"first test with greg surges / pucktronix tabulaRasa DIY wavetable oscillator for eurorack. i made a wave table set of various sine tones using different combinations of the overtone series. there is some filtering by my cwejman MMF-1 & also a lot of the synthtech e580 mini-delay."

Thursday, April 05, 2012

tabulaRasa Quick Demo


YouTube Uploaded by robinsomniac on Apr 5, 2012

"Quick demonstration of the tabulaRasa DIY synth module by Greg Surges. No effects, filters, or any other modules used, just the PWM output through an attenuator into an amp. The SD card is loaded with human voice waveforms from Adventure Kid.

Nice looking module, ain't it? I have a few panels left, contact me if you're interested in one."

Friday, February 25, 2011

tabulaRasa Volt Per Octave Demo


YouTube via surgesg | Feb 25, 2011 |

"https://www.kickstarter.com/projects/...

A demo showing the tabulaRasa Wavetable Oscillator (on a scope) playing various tonal pitch sequences."

Thursday, January 06, 2011

tabulaRasa wavetable oscillator


via gregsurges.com where you'll find a slightly bigger pic.

"Here's the first prototype of my tabulaRasa wavetable oscillator module. Making progress on the tabulaRasa hardware – ordered the second prototypes from dorkbotpdx today. More soon."

follow-up to this post where you'll find a video of the breadboard version.

Friday, October 29, 2010

USB-Octomod Demonstration


YouTube via surgesg | October 29, 2010
follow-up to this post.
"http://www.gregsurges.com/circuitry/u...
The USB-Octomod is a USB device which allows generation of computer-controlled analog synthesizer control voltages in the range of approximately +/- 5V. Using a small open-source and cross-platform host application, the user is able to control the 8 output channels of the Octomod through a simple OSC interface. The OSC interface allows composers, musicians, etc. to control the Octomod from their software environment of choice. PCBs, DIY Kits, and Fully Assembled Boards available at http://www.gregsurges.com/"

Tuesday, October 26, 2010

tabulaRasa: Arduino Shield Wavetable Oscillator - Cycling Waveforms


YouTube via surgesg | October 26, 2010

"The tabulaRasa is a Wavetable Oscillator on an Arduino Shield. Users can design and load their own waveforms.
Here, the oscillator cycles through 11 custom waveforms.

tabulaRasa is currently in development...

http://www.gregsurges.com/"

Arduino Wavetable Oscillator Demo

"Using an Arduino, voltage-to-frequency converter, and digital-to-analog converter to make a wavetable oscillator. The sinewave output is stored in a memory array on the Arduino, and read out at varying frequencies - which are determined by a voltage input. See more at http://www.gregsurges.com/"

Monday, October 04, 2010

USB-Octomod - USB to CV Project

"The USB-Octomod is a USB device which allows generation of computer-controlled analog synthesizer control voltages in the range of approximately +/- 5V. Using a small open-source and cross-platform host application, the user is able to control the 8 output channels of the Octomod through a simple OSC interface. The OSC interface allows composers, musicians, etc. to control the Octomod from their software environment of choice."

You can find more details on the project on Greg Surges' site here. Be sure to check out his other projects as well.
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