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MBRASS -- brass instrument physical model
in RTcmix/insts/stk quick syntax:MBRASS(outsk, dur, AMP, FREQ, SLIDELEN, LIPFILT, maxpressure[, PAN, BREATHENV])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. p0 = output start time (seconds) p1 = duration (seconds) p2 = amplitude (absolute, for 16-bit soundfiles: 0-32768) p3 = frequency (Hz) p4 = slide length (samps) p5 = lip filter (Hz) p6 = max pressure (0.0-1.0) p7 = pan (0-1 stereo; 0.5 is middle) [optional; default is 0.5] p8 = breath pressure table [optional; default is 1.0] p2 (amplitude), p3 (frequency), p4 (slide length), p5 (lip filter) and p7 (pan) can receive dynamic updates from a table or real-time control source. p8 (breath pressure table), if used, should be a reference to a pfield table-handle. Author: Brad Garton, based on code from the Synthesis ToolKit MBRASS is the "Brass" physical model in Perry Cook and Gary Scavone's STK, the Synthesis ToolKit. Usage NotesMBRASS models a simple brass instrument, using digital waveguide techniques. Dum-dah-dah-DAAAAAH! Here's what Perry says about "Brass":
note (oct.pc) slide length (p4) lip filter (p5) max pressure (p6)
7.00 103 140 0.045
7.01 103 150 0.05
7.02 103 160 0.07
7.03 103 170 0.1
7.04 100 180 0.1
7.05 95 188 0.15
7.06 90 195 0.15
7.07 80 207 0.2
7.08 75 220 0.2
7.09 70 235 0.2
7.10 65 250 0.2
7.11 55 255 0.2
8.00 50 265 0.2
8.01 45 280 0.2
8.02 43 295 0.2
8.03 40 320 0.1
8.04 40 340 0.25
8.05 35 355 0.25
8.06 30 370 0.25
8.07 30 395 0.3
8.08 25 415 0.3
8.09 15 430 0.3
8.10 10 450 0.3
8.11 10 480 0.2
8.11 (alt) 270 450 0.23
9.00 10 520 0.2
9.00 (alt) 255 480 0.23/0.25
9.01 240 490 0.3
9.02 228 530 0.3
9.03 215 550 0.35
9.04 202 590 0.4
9.05 190 640 0.4
9.06 180 670 0.45
9.07 170 710 0.5
9.08 160 740 0.55
9.09 150 780 0.6
9.10 142 840 0.6
9.11 134 860 0.65
10.00 127 940 0.7
These are approximate. Also note that the same pitch may be produced
by different combinations of parameters.
Also be aware that some combinations of parameters will yield no sound. The 'physics' have to work correctly! MBRASS can produce other mono or stereo output. Sample Scoresvery basic:
rtsetparams(44100, 2)
load("MBRASS")
amp = 40000
breathenv = maketable("line", 1000, 0,0, 0.05,1, 3.0,3, 3.5,0)
MBRASS(0, 3.5, amp, 249.0, 200, 279.0, 0.3, 0.5, breathenv)
MBRASS(4, 3.5, amp, 249.0, 400, 279.0, 0.3, 0.5, breathenv)
slightly more advanced:
rtsetparams(44100, 2)
load("MBRASS")
freq = maketable("line", "nonorm", 1000, 0,201, 1,314)
pan = makeLFO("tri", 0.5, 0.0, 1.0)
MBRASS(0, 3.5, 15000, freq, 200, 279.0, 0.3, pan)
bamp = maketable("line", 1000, 0,0, 1,1, 2,0)
slide = maketable("line", "nonorm", 1000, 0, 100, 1, 400, 3, 200)
lipfilt = makeLFO("sine", 3.5, 250, 400)
MBRASS(4, 3.5, 20000, 249.0, slide, lipfilt, 0.3, 0.5, bamp)
fun stuff!
rtsetparams(44100, 2)
load("MBRASS")
srand()
breathamp = maketable("line", 1000, 0,0, 5,1, 10,0)
/* amps */
amps = { 30000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000, 20000 }
lamps = len(amps)
/* pch */
pches = { 7.05, 7.07, 7.10, 8.00, 8.02, 8.03, 8.05, 8.07, 8.09, 8.10, 9.00, 9.02, 9.03, 9.05, 9.07, 9.09, 9.10, 10.00 }
/* slide length */
slidelen = { 95, 80, 65, 50, 43, 40, 35, 30, 15, 10, 255, 228, 215, 190, 170, 150, 142, 127 }
/* lip filter */
lipfilt = { 188, 207, 250, 265, 295, 320, 355, 395, 430, 450, 480, 530, 550, 640, 710, 780, 840, 940 }
/* max pressure */
maxpress = { 0.15, 0.2, 0.2, 0.2, 0.2, 0.2, 0.25, 0.3, 0.3, 0.3, 0.25, 0.3, 0.35, 0.4, 0.5, 0.6, 0.6, 0.7 }
start = 0
for(i = 0; i < 100; i=i+1)
{
index = trand(0, lamps)
amp = amps[index]
pch = pches[index]
slide = slidelen[index]
lip = lipfilt[index]
pressure = maxpress[index]
dur = irand(1.7, 2.7)
MBRASS(start, dur, amp*0.4, cpspch(pch), slide, lip, pressure, random(), breathamp)
start = start + (random() * 0.2 + 0.1)
}
See Alsomaketable, CLAR, MBLOWBOTL, MBLOWHOLE, MBOWED, MCLAR, METAFLUTE, MSAXOFONY, MSITAR |