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A Virtual String Instrument based on the Karplus Strong
Algorithm.
CONTENTS:
- Overview
- Description of modules and controllers
- Version History
OVERVIEW:
An exitation signal is triggered by a note on event or a
continous controller. This Signal is fed into a Karplus-Strong
oscillator. The outcome is then filtered to simulate a resonating
instrument body. Part of the original waveguide signal and of the
filtered signal is fed into a system of 12 sympathetic strings that is
simulated by a cluster of Karplus Strong oscillators.
The Synth supports alternative
tunings for Midi Note input. These are accessible from a seperate
Panel. The Sympathetic Strings can also
be retuned.
The Modules:
EXCITATION:
The 'Pluck' is created here as a mix of filtered noise and an
(optionally filtered) saw/triangle signal.
- [Pluck/Cont] - Fades between
continous(Bow)and plucked Excitation. Pluck can be used for Plucked
strings and percussive patches while Bow is appropriate for bowed,
breathy and lead sounds.
- [Breath/Mod/AT] - switch to select the
continous controller for the bowed excitation. Choices are Breath (CC2)
Mod Wheel and Channel Aftertouch
- [Noise/Saw] - Blends between filtered noise
and a Triangle/Saw signal
- [Tri/Saw] - Blends between a Triangular and
a Saw Waveshape.
- [Filter Saw] - Switches the filtering on for
the Tri/Saw oscillator.
- [Color],[Amt] - Filterfreqency is
[Color] x [Note on frequency]. The Amt
Parameter controls the influence that the note on velocity (pluck) or
the Continous controller (bow) has on the filter frequency.
- [Body] - The Body Knob blends between 2 Pole
Bandpass and Lowpass filter
- [Q] - Filter quality
- [Att(Cont)],[Re(Cont)] - Attack and
Release of the Excitation Envelope (only for the Bowed Excitation)
- [Pluck] - Pluck volume
- [Intensity],[Amt] - Excitation
amplitude.
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OSC (Voice):
Defines the characteristics of the virtual string:
- [Mute],[Key] - dampens the sound.
- [brilliance] - changes the sound from Nylon to Steel
(or maybe from pure Nylon to Brasswound nylon ;)
- [Threshold],[Release] - Controls for the
Limiter
- [Att],[Dec],[Rel] - Envelope controls
- [Voice Level] - Output level (This has no influence
on the voice amount that is fed into the Voice or Symp oscillators)
OSC(Symp):
Controls for the Sympathetic cluster.
- [Tune] - The cluster is tuned in a diatonic scale in
the key of C major. Use the Tune knob to transpose the sympathetic
strings.
- [Mute],[Key] - dampens the sound.
- [brilliance] - changes the sound from Nylon to Steel
(or maybe from pure Nylon to Brasswound nylon ;)
- [Threshold],[Release] - Controls for the
Limiter
- [Symp Level] - Output level (This has no influence
on the symp amount that is fed into the Voice or Symp oscillators)
- [FB S>S] - will feed each Symp string output back
into itself.
EX AND FB > VOICE:
Here the Excitation is mixed with a number of Feedback
signals. Sources are: The voice output, the sympathetic cluster, and
the final filtered output (body). This composed signal is then
compressed to minimize the risk of feedback resonance.
- [FB B>V] - The filtered 'Body' Signal contains
the whole mix
- [FB S>V] - The input from the sympathetic cluster.
- [FB V>V] - The Amount of the Voice Signal
- [Threshold],[Release] - Controls for the
Limiter
FB > SYMP:
- [FB S>S] - The output of the whole cluster is fed
back into all the oscillators.
- [FB V>S] - The Amount of the Voice Signal.
- [FB B>S] - The filtered 'Body' Signal contains
the whole mix
- [Threshold],[Release] - Controls for the
Limiter
BUZZ:
Some edge can be added to the Voice output.
- [Buzz] - A simple clipper
- [Buzz Amt] - Mix of buzzed and unbuzzed signal
- [bypass] - switches the buzzer of
FB ENV:
The Feedback envelope works on the Voice Signal that is fed
back into itself and into the Symp Cluster.
- [Att],[Dec/Rel],[Vol] - the Vol
parameter is fully active when Pluck is selected. Vol rises to 1 as the
continous (bowed) excitation is faded in.
Body:
Two cascaded Filters (2 pole LP) are used to simulate an
instrument body.
- [F1],[Q1],[F2],[Q2] - Filter
controls
- [Amt F1] - Mixes the output of Filter 1 with the
unfiltered signal. The crossfade output is then fed into Filter2
- [Amt F1/2] - Mix of the Filter 2 output with the
unfiltered signal.
History:
KS Symp4:
KS Symp5:
- fixed some bugs
- Replaced Compressors with new CPU friendly Limiter modules
- Introduced Limiters as Feedback Protection also at the
output of the Voice oscillator and of each Sympathetic oscillator.
- Panel restructured
- reworked the Presets
- Continous controller selection Mod/Breath/Aftertouch
introduced in the excitation module (for bowed sounds)
KS Symp7:
- Restructured the Excitation Module
- Replaced the Bow/Pluck switch with a control. This enables
fades between the two modes.
- Added a Tuning table to the Sympathetic Cluster.
- Added a Tuning Table to the Midi Note Input
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