smoge / b259wf

Buchla 259 wavefolder in Faust

b259wf

This is a model of the "tibre" circuit of the Buchla 259 Complex Wave Generator, made in Faust. The model follows the circuit modelling as seen on the paper Virtual Analog Buchkla 259 wavefolder, using 5 folds. The proposed 2-point BLAMP antialiasing method has been attempted for arbitrary sources as shown here, but it is not sufficient for high frequencies and/or more complex signals. Instead, filtering and light cubic nonlinearity distiorion has been used to round corners and for clipping. The user interface consists of the controls fold for the folding amount, offset for offseting the signal before folding, and lowpass as a final stage one-pole filtering to control the character (too much folding might introduce unwanted higher harmonics for certain signals). The final output is dc-blocked.

Instructions

Clone the repository:

git clone https://github.com/kgwgk/b259wf

This includes the UGen binary for using with supercollider (the *.sc and *.scx files). Note this is compiled and tested only under OSX. Copy the relevant files to the SC extension folder:

cd b259wf
cp {b259wf.sc,b259wf.scx} <path/to/SC/extensions>

From SuperCollider run:

Platform.userExtensionDir to find the user folder, or

Platform.systemExtensionDir for the system one

The file test.scd includes an example using the provided sample with SuperCollider.

Manual compilation

The easiest way to compile binaries from the .dsp file, is by using the Faust online compiler. If you are compiling for SuperCollider though, the online compiler exports will be unusable for versions >=3.9. You should instead compile it locally, on your machine.

You should have the latest Faust instaled, and have access to the faust2<export mode> binaries. The SC headers are needed for faust2supercollider. Assuming you are on your user directory:

git clone https://github.com/supercollider/supercollider.git
export SUPERCOLLIDER_HEADERS=/path/to/supercollider/include
faust2supercollider path/to/b259wf/b259wf.dsp