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Tube Dreamer

VA circuit modeling of the infamous green stompbox.

(8 Votes)
Andre Bopp
1.0 (Updated 1 year ago)
5.8MB
October 27, 2021
Reaktor 6
Effect Distortion

DESCRIPTION

Virtual analog circuit modeling of the infamous green guitar pedal. The frequency response seems to match the original relatively well.

The Clipping Stage and Tone Stack of the circuit were modeled using the Nodal DK method. To solve the implicit nonlinear equation of the diodes, the iterative Newton-Raphson method was used. (Outdated see changelog)

Controls:
- Drive
- Tone
- Out
- In (default -15 dB)
- Switchable Soft Limiter
- Diode Age Knob (adjustable Diode Ideality Factor)
- Oversampling (2x, 4x, 8x)

The limited amplitude at the input is necessary, because the modeled circuit does not (yet) react kindly to dB values above 0 dB and sometimes tends to explode. Therefore CAUTION!!!

Solution (10.11.2021): If the audio overloads at high input volume and high drive settings, turn down the output volume or the input volume of the pedal (this is probably due to the interconnectivity of the circuit). If it gets too quiet, just turn up the ensemble volume or add an amp at the end of the signal chain on the primary level.

You can find the used schematic under the following link:
https://www.electrosmash.com/tube-screamer-analysis

The GUI was created with Skin- and Knobman.

The whole thing was implemented with the help of recorded tutorials from HackAudio. (https://www.hackaudio.com/) [The videos are on the Patreon page].

By karachay (Andre B.)

------------------------------------------------------------------------------------------
Changelog

01.11.2021 - Added Quiet Switch from Z Gabr to the Power-button. Clicking is now hardly audible when pressing the power-button during audio playback.

09.11.2021 - Quiet Switch corecell has been moved to its own coremacro. Now you really shouldn't hear any "clicks" and "pops" when pressing the power switch.
The default input amplitude setting was set to -15 dB.

11.12.2021 - The nonlinear implicit equation is no longer solved iteratively, but using an approximation of the Wright Omega function, which allows implicit equations to be solved analytically. Although the ensemble now consumes about 8-9% CPU at rest, it rarely goes over the 10% CPU limit with 8x antialiasing. Uploaded a new sound demo for this.

!!! Unfortunately, it clicks loudly once when opening the ensemble. !!!

Here is the paper on the Wright Omega function: https://dafx2019.bcu.ac.uk/papers/DAFx2019_paper_5.pdf

12.12.2021 - The loud click when opening the ensemble or during the initialization process should now be fixed. In the Tone Stack module, a connection was not connected; This is now fixed.

COMMENTS  (6)

mv audioware (mvshmusik)
3 months ago
This may as well be the most remarkable distortion effect I've seen so far on the reaktor UL. Compared to other "virtual analog" ensembles, this uses a white-box approach, giving a highly accurate sound. Thank you for sharing!
Ari
9 months ago
This is the only Tube Screamer emulation I've ever liked. Thank you for sharing this! Diode age was a nice touch.
Andre Bopp
1 year ago
Am not familiar with ZDF filter. Depending on the number of parameters to be estimated, the procedure would have to be adapted somewhat, but theoretically it should work.
andrew aronson
1 year ago
wonder if this method could be used as a solver for a zdf filter?
andrew aronson
1 year ago
wow!
Robert Savell
1 year ago
Fascinating.
now