#patchwerk — Public Fediverse posts

valp1 is a VA one-pole lowpass filter implemented in ANSI C: https://pbat.ch/sndkit/valp1/ using #literateprogramming

It's based on the implementation found in the The Art of VA Filter design by Vadim Zavalishin, a #DSP engineer of native instruments and creator of Reaktor.

I've uploaded a sample of what it sounds like when you use it to filter noise. Because it's only 1-pole, it sounds an awful lot like gain control.

I've also ported it to a #patchwerk node in #monolith. Here's the #runt code used to generate the sound:

patchwerk nodes

0.5 noise
1 1 sine 100 1000 biscale
valp1

"valp1.wav" wavout bdrop

sr 20 * _compute rep

Working on a linear feedback shift register noise generator based on the NES APU specs found here: https://wiki.nesdev.com/w/index.php/APU_Noise

I've wrapped it into a #patchwerk node called bitnoise, and made a little patch to test it out (audio attached).

Here is the #runt code that generated it:

patchwerk nodes
60 300 1 randi 5000
2 dmetro 0.5 0 maygate 0.1 port 1 20 scale
randi
1 dmetro 0.5 0 maygate bitnoise
0.1 mul
8000 butlp
"test.wav" wavout bdrop
sr 20 * _compute rep

Some impromptu textures using a processed crossfade-looped vocal sample I had laying around, and some just intonation ratios. Written using #runt and #patchwerk via #monolith, with some light processing in #sox for fades.

Code:

patchwerk nodes

"longpad.wav" loadwav 0 regset

2 0 phasor 0 regget trd
2 1.5 * 0 phasor 0 regget trd add
2 16 * 9 / 0 phasor 0 regget trd add

0.5 0 phasor 0 regget trd
0.25 0 phasor 0 regget trd add
1 0 phasor 0 regget trd add
1 5 / 1 sine 0 1 biscale mul
add

-3 ampdb mul

out

30 set_dur

write_wav