MBOWED

Bowed-string physical model.

in RTcmix/insts/stk

quick syntax:

MBOWED(outsk, dur, AMP, FREQ, vibfreqlo, vibfreqhi, VIBDEPTH, PAN, BOWVELENV, BOWPRESSENV, BOWPOSENV, VIBTABLE)

CAPITALIZED parameters are pfield-enabled for table or dynamic control (see the maketable or makeconnection scorefile commands). Parameters after the [bracket] are optional and default to 0 unless otherwise noted.

Param Field Parameter Units Dynamic Optional Notes
p0 output start time seconds no no  
p1 duration seconds no no  
p2 amplitude absolute, for 16-bit soundfiles: 0-32768 yes no  
p3 frequency Hz yes no  
p4 vibrato freq low Hz no no  
p5 vibrato freq high Hz no no  
p6 vibrato depth % of base frequency [decimal notation 0.1 == 10%] yes no  
p7 pan 0-1 stereo; 0.5 is middle yes no  
p8 bow velocity (amplitude) reference to pfield table-handle yes no tabl
p9 bow pressure table reference to pfield table-handle yes no  
p10 bow position table reference to pfield table-handle yes no  
p11 vibrato wavetable reference to pfield table-handle yes no  

Parameters labled as Dynamic can receive dynamic updates from a table or real-time control source.

Author: Brad Garton, based on code from the Synthesis ToolKit

MBOWED the “Bowed” physical model in Perry Cook and Gary Scavone’s STK, the Synthesis ToolKit.

Usage Notes

MBOWED models a bowed-string, using waveguide filter techniques. Info from the original STK instrument source code:

This instrument was coded before the new pfield-enabled capabilities were introduced to RTcmix, so the vibrato is built-in to the instrument. The vibrato will vary randomly in frequency between p4 (“vibfreqlo”) and p5 (“vibfreqhi”), with the amount controlled by p6 (“VIBDEPTH”). The waveform used for the vobrato is passed in through p11 (“VIBTABLE”). Nowadays the vibrato could be handled through a dynamic pfield control using p3 (“FREQ”), but MBOWED will exit if the vibrato information in p4, p5, p6 and p11 is not present.

The three other pfield table-handles (p8, “BOWVELENV”; p9, “BOWPRESSENV”; p10, “BOWPOSENV”) can vary from 0.0-1.0 and control aspects of the modeled bow during the duration of the note.

MBOWED can produce other mono or stereo output.

Sample Scores

very basic:

   rtsetparams(44100, 2)
   load("MBOWED")

   amp = 20000
   bowvelenv = maketable("line", 1000, 0,0, 1,1, 2,0)
   bowpressenv = maketable("line", 1000, 0,1, 1,1)
   bowposenv = maketable("line", 1000, 0,1, 2,0, 3,1)
   vibwave = maketable("wave", 1000, "sine")
   MBOWED(0, 7, 20000, 287.0, 5, 7, 0.02, 0.5, bowvelenv, bowpressenv, bowposenv, vibwave)

slightly more advanced:

   rtsetparams(44100, 2)
   load("MBOWED")

   amp = 20000
   ampenv = maketable("line", 1000, 0,0, 1,1, 9,1,10,0)
   bowvel = makeLFO("sine", 0.5, 0.2, 0.8)
   freq = maketable("line", "nonorm", 1000, 0,287, 1,350, 5,197.5)
   vdepth = maketable("line", "nonorm", 1000, 0,0, 1,0.1)
   pan = makeLFO("saw", 1.0, 0.0, 1.0)
   bowpress = maketable("line", 1000, 0,1, 1,0.8, 2,1, 3,0.7, 4,1)
   bowpos = maketable("line", 1000, 0,0, 2,1, 3,0)
   vibtable = maketable("wave", 1000, 1, 1)

   MBOWED(0, 7, amp*ampenv, freq, 3, 7, vdepth, pan, bowvel, bowpress, bowpos, vibtable)

See Also

maketable, CLAR, MBLOWBOTL, MBLOWHOLE, MBRASS, MCLAR, METAFLUTE, MSAXOFONY, MSITAR