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Category: Multimedia/Audio/Audio-Plugins
Boing
Download: http://www.breathcube.com/vst/boing.zip
Operation System: Windows All
License:
Size: 1 MB
Date: 2008-12-24 00:12:49
There are three sections: the string, which changes length in accordance with the played pitch, the bridge, and the body of the instrument, which i call the resonator.
Each waveguide includes two delays: one to model vibrations travelling in each direction. since the string is divided at the junction of bow and string, boing uses eight delays in total. note that the resonator paths return to the center and are thus twice the length to avoid using ten delays.
The bow-string junction compares the motion of the bow and the motion of the vibrating string and uses the friederlander-keller transform to create vibrations travelling away from the bow.
When the difference between the two velocities isn't too different, the bow and string are considered to be 'sticking together,' and the bow drags the string. at a greater differential, they slip and there is less transference of force from the bow to the string.
Although this is a very simple schematic, real acoustic instruments are generally shaped to emphasise these basic paths of transmission, and other products similarly employ them.
Retention of harmonics:
the most significant performance feature of the digital delay vs. a physical instrument is the retention of energy. boing is a much simpler system than a real bowed string. using a high feedback setting can pleasingly emphasize tonal characteristics, but is unrealistic when parameters are changed.
High bowing velocity, force and other settings can create harmonic 'folds' in the output waveform, resulting in the higher harmonics reminiscent of similar performance with an acoustic instrument. damping/energy dispersion in the waveguide model is achieved by filtering and as a function of delay interpolation, which naturally 'smooths' the waveform.
When bowing force is decreased in a real bowed instrument, energy rapidly dissipates. the dispersion in boing does not eliminate high harmonics from the fundamental delay cycle as rapidly due to the simplified system.
This means that it is difficult to play a note with boing that decreases in energy realistically. automating feedback and low pass settings may help.
Left: low velocity
right: high velocity - same fundamental cycle has multiple peaks
About tuned delays:
a common issue with tuned delays occurs when the pitch (delay length) is changed. this is heard as a ping or click at the beginning of the new note that is more discernible at transitions to lower pitches.
A solution when sequencing the vsti is to use two instances and alternate the notes between them. this technique is commonly used internally in waveguide modeling, and of course results in twice the cpu at note transitions.
Another solution for developers is to use two read pointers for the delay buffers, one at the old pitch and one at the new. a short crossfade is then employed.
Since boing uses 4 interpolated delays for the string/pitch, this would result in twice as many interpolation calculations and pointers, which again significantly increases cpu. since cpu use is still an issue for many vsti users, i have left it up to the user to use the first method if required.
Another possible solution is to modulate feedback and damping settings during significant pitch transitions.
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