11.0

Synth objects 253
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Synthesis models
The sound synthesis in BeatBox 2 consists of a simple sampler and a
synthesizer which includes three different synthesis modules.
Sampler
The sampler plays short sound recordings ("samples") in different
pitches. The sampler is intended for creating all kinds of drum
sounds; the sounds are static and unnatural if the pitch is not altered.
This is why the sampler is combined with on of the three synthesis
models.
Filtered noise
White noise is filtered by two band-pass filters with separately setup
frequencies and resonance. This algorithm is suitable for creating
synthetic snares and high hat sounds.
Phase distortion synth
Two oscillators with regulated phase distortion and thoroughly
variable frequency modulate each other (FM/cross-modulation/ring-
modulation). Depending on the setting, this algorithm can be used to
create kick, tom, or metallic percussion sounds; higher values for
frequency and modulation level produce noisier sounds for high hats
or shaker sounds. Since the oscillator frequency can be set exactly
according to the musical pitch, this model can be used to produce
mass lines or melodies.
Physical modeling
This is a simple physical model of an "abstract" percussion
instrument. A fed-back network of delays is caused to oscillate by an
impulse of filtered white noise (exciter). Depending on the setting of
the exciter, the size of the model (surface), and the damping, a wide
spectrum of natural sounding percussion instruments like cymbals,
claves, gongs, or triangles can be created.
Multimode filter/Envelope generator
Following the samplers and synthesizers, an inverse filter (multi-mode
filter) is added to add the last bit of polish to the drum sound. The
envelope generator controls all time-dependent processes in the
synthesizer and sampler.