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ld grain
Uses Oskari Tammelin's XDSP Beta 2 library.
0. warnings
THE SOUND IS VERY DEPENDENT ON SAMPLING RATE. CHANGING OUTPUT SAMPLING
RATE *WILL* BREAK YOUR SONG!
... and don't set grain density too high, unless you have a fast cpu.
1. what is a grain?
i'm not sure what is the exact definition of a sound grain but in
this synth it's a short piece of audio data clipped from a wavetable
wave. the piece is very short, usually less than 50ms. each grain
has it's own envelope and can be replayed at any speed. a grain can
also be extended in length, with it's contents looped. the wavetable
wave position that is used as a grain data source can also be advanced
at different speeds. also multiple grains can be played at the same
time, but this will cause cpu usage to rise.
2. notes on parameters for the grain generator:
inertia
inertia does not affect all parameters.
tuning1
affects waveform playback speed.
tuning2
affects note pitch or waveform playback speed if notetarget is C.
wave
selects waveform index.
glength
grain length in samples.
gdensity
distance between grains, relative to glength.
gdatalen
length of grain data from wavetable in samples.
gposstart
position in wavetable where to start on note-on.
gposdelta
position advancement in wavetable for each grain in samples.
gpitchmod
pitch modulation during grain.
gloopmode
grain data loop mode. grain data (length set with gdatalength) is
always looped, this parameter selects forward looping or ping-pong
looping.
wloop
enable/disable sample looping.
resetloop
if 'on', sample position will be reset whenever a note-on occurs.
gdenslen
causes gdensity to modify glength too. if gdensity is 50%,
also glength is scaled to 50%.
notetarget
selects different note handling mode. different modes allow sound
pitch to be modified with note pitch in different situations.
GEnvA/A[M]/D/D[M]/Mdl/Amnt
modify grain envelope.
grain envelope is a bezier curve. A controls envelope attack shape,
D decay shape. A[M] and D[M] allow a bit more control on the shapes.
Mdl is envelope middle position, 50% causes attack and decay length
to be the same. Amnt changes envelope amount on grain volume.
amount 0% = grain volume always at maximum, amount 100% = grain
volume completely controlled by envelope (beginning and end at zero,
middle at maximum).
3. notes on parameters for the grain effect:
the parameters are the same as in the grain generator, except for a few
missing parameters only useful for samples. the latest received input
sound will be used as grain material.
4. extras
there's a built-in dc filter, enable it in the attributes. it's not
very good, though.
- ld0d (C) Lauri Koponen
Visit lD0d's website