Now instead of continuing to enhance the same instrument, we will design a totally different one. In it we'll play a soundfile from disk in the orchestra, apply an amplitude envelope to it, and add some reverb. To do this we will employ Csound's soundin and reverb generators. The first is used like this:
a1 soundin ifilcod[, iskiptime[, iformat]]
soundin derives its signal from a pre-existing file. ifilcod is either the filename in double quotes, or an integer suffix (.n) to the name "soundin". Thus the file soundin.5 could be referenced either by the quoted name or by the integer 5. To read from 500ms into this file we might say (i.e. to skip the first 500ms):
a1 soundin "soundin.5", .5
The Csound reverb generator is actually composed of four parallel comb filters plus two alpass filters in series. Although we could design a variant of our own using these same primitives, the preset reverb is convenient, and simulates a natural room response via internal parameter values. Only two arguments are required the input (asig) and the reverb time (krvt)
ar reverb asig, krvt
Here's a schematic representation of the instrument.
![[TOOT 8 Schematic]](images/toot08.gif)
TOOT 8 Schematic
The soundfile instrument with artificial envelope and a reverb (included directly) is as follows:
<CsoundSynthesizer> <CsOptions> -odac </CsOptions> <CsInstruments> instr 8 idur = p3 iamp = p4 iskiptime = p5 iattack = p6 irelease = p7 irvbtime = p8 irvbgain = p9 kamp linen iamp, iattack, idur, irelease asig soundin "fox.wav", iskiptime arampsig = kamp * asig aeffect reverb asig, irvbtime arvbretrn = aeffect * irvbgain out arampsig + arvbretrn endin </CsInstruments> <CsScore> ;ins strt dur amp skip atk rel rvbt rvbgain i8 0 2.28 .3 0 .03 .1 1.5 .3 i8 4 1.6 .3 1.6 .1 .1 1.1 .4 i8 5.5 2.28 .3 0 .5 .1 2.1 .2 i8 6.5 2.28 .4 0 .01 .1 1.1 .1 i8 8 2.28 .5 0.1 .01 .1 0.1 .1 e </CsScore> </CsoundSynthesizer>