The following instrument uses the Csound rand unit to produce noise, and a reson unit to filter it. The bandwidth of reson will be set at i-time, but its center frequency will be swept via a line unit through a wide range of frequencies during each note. We add reverb as in Toot 9.

garvbsig	init	0
instr 10	; toot10.orc
	iattack	=	.01
	irelease	=	.2
	iwhite	=	22050
	idur	=	p3
	iamp	=	p4
	isweepstar	=	p5
	isweepend	=	p6
	ibandwidth	=	p7
	ibalance	=	p8	; pan: 1 = left, .5 = center, 0 = right
	irvbgain	=	p9
	kamp	linen	iamp, iattack, idur, irelease
	ksweep	line	isweepstart, idur, isweepend
	asig	rand	iwhite
	afilt	reson	asig, ksweep, ibandwidth
	arampsig	=	kamp * afilt
	outs	arampsig * ibalance, arampsig * (1 - ibalance)
	garvbsig	=	garvbsig + arampsig * irvbgain
endin
instr 100
	irvbtime	=	p4
	asig	reverb	garvbsig, irvbtime
	outs	asig, asig
	garvbsig	=	0
endin