A physical model of a bowed bar, belonging to the Perry Cook family of waveguide instruments.
iconst (optional, default=0) -- an integration constant. Default is zero.
itvel (optional, default=0) -- either 0 or 1. When ktvel = 0, the bow velocity follows an ADSR style trajectory. When ktvel = 1, the value of the bow velocity decays in an exponentially.
ibowpos (optional, default=0) -- the position on the bow, which affects the bow velocity trajectory.
ilow (optional, default=0) -- lowest frequency required
kamp -- amplitude of signal
kfreq -- frequency of signal
kpos -- position of the bow on the bar, in the range 0 to 1
kbowpres -- pressure of the bow (as in wgbowed)
kgain -- gain of filter. A value of about 0.809 is suggested.
Here is an example of the wgbowedbar opcode. It uses the files wgbowedbar.orc and wgbowedbar.sco.
Example 15-1. Example of the wgbowedbar opcode.
/* wgbowedbar.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
instr 1
; pos = [0, 1]
; bowpress = [1, 10]
; gain = [0.8, 1]
; intr = [0,1]
; trackvel = [0, 1]
; bowpos = [0, 1]
kb line 0.5, p3, 0.1
kp line 0.6, p3, 0.7
kc line 1, p3, 1
a1 wgbowedbar p4, cpspch(p5), kb, kp, 0.995, p6, 0
out a1
endin
/* wgbowedbar.orc */
/* wgbowedbar.sco */
i1 0 3 32000 7.00 0
e
/* wgbowedbar.sco */