PAuKn - The Pitched Audio Knife

Control the pitch of various pitched base effects (the dwgs and granulator are neat) with MIDI and note expression in VST3.

Effects

Granulator - Breaks the input into grains which are cycled through
Biquad filter - Includes bandpass, notch, lowpass, and hipass filter
Comb - A delay based comb filter
Decimator - Sample and hold.
DWGS - Digital waveguide synthesis. Simulating a string which is excited by the input.
Sync - Sync oscillator. Zero crossings in the input reset the phase of a carrier oscillator. Tracks envelope of input.

Controlling PAuKn

Inputs

ID	Name	Description
MIDI 0xE0	Pitchbend	Always changes pitch of all up to range controlled by pitchbend range param
Note Expression ID	Description	Notes
NE0	Gain	Always changes gain
NE1	Pan	Doesn't change pan, used by different effects as below
NE2	Tuning	Always changes pitch by standard amount, not affected by pitchbend range
NE3	Vibrato	not used
NE4	Expression	not used
NE5	Brightness or Timbre	Used by effects as below

What the inputs do for each effect

	Granulator	Biquad filter	Comb	Decimator	DWGS	Sync
MIDI note	grain length	cutoff	delay line length	sample frequency	delay line length	carrier osc frequency
Tuning NE2	"	"	"	"	"	"
Pitchbend	gain step	"	"	"	"	"
Velocity	-	Q	feedback	# bits	loss	carrier shape
Poly Pressure	grain crossover	"	"	"	"	"
Sensitivity param	-	"	"	"	"	"
Gain NE0	gain	gain	gain	gain	gain	gain
Pan NE1	grain step	-	-	-	string lopass	trigger level
Timbre NE5	grain rate	-	-	-	string inpos	-

Parameters

Tuning and volume are global. Additional parameters are below.

Biquad Parameters

biquad stages - # of stages, which affects the resonance and rolloff

Sync Parameters

shape - varies the carrier osc smoothly from atriangle wave to square-ish wave
trigger level - resets phase of carrier osc when this signal level is crossed
env time - the time constant of envelope tracker

DWGS Parameters

inpos - position of input on string
loss - loss at string terminal
lopass - lopass filter falloff at string terminal
anharm - string anharmonicity

Granulator Parameters

rate - how fast to advance the grains through the buffer
crossover - how much to smooth between grains
step - how much to step through the grain each tick
size - the total buffer length to be filled, in beats

Plugin support

Originally written and used in Cubase VST2. Rewritten for VST3 SDK and tested on Ableton Live 11, where MPE doesn't work, and on Bitwig where note expression works.

Installation

Requires vst3sdk. CMake should acquire the package from git or you can specify -DVST3_SDK_DIR=

to cmake.

git clone https://github.com/claytonotey/paukn.git
cd paukn
cd build-<platform>
. build.sh
make -j 4

And you should have a VST3/paukn.vst3 in your build directory, which you can move where you please.

claytonotey / paukn

readme