Description

These statements are global value assignments, made at the beginning of an orchestra, before any instrument block is defined. Their function is to set certain reserved symbol variables that are required for performance. Once set, these reserved symbols can be used in expressions anywhere in the orchestra.

Syntax

kr = iarg

Initialization

kr = (optional) -- set control rate to iarg samples per second. The default value is 4410.

In addition, any global variable can be initialized by an init-time assignment anywhere before the first instr statement. All of the above assignments are run as instrument 0 (i-pass only) at the start of real performance.

Beginning with Csound version 3.46, kr can be omitted. Csound will use the default values, or calculate kr from defined ksmps and sr. It is usually better to just specify ksmps and sr and let csound calculate kr.

Examples

sr = 10000
kr = 500
ksmps = 20
gi1 = sr/2.
ga init 0
itranspose = octpch(.0l)

Examples

Here is an example of the kr opcode. It uses the file kr.csd.

<CsoundSynthesizer>
<CsOptions>

; Select audio/midi flags here according to platform
; Audio out   Audio in
-odac         ;;  -iadc    ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o kr_example.wav -W ;;; for file output any platform

; By Stefano Cucchi 2020

</CsOptions>

<CsInstruments>

sr     =        44100

kr = 4410 ; NO glitch
;kr = 10 ; Some GLITCH in kFreqMod
;kr = 2 ; Lots of GLITCH in kFreqMod
nchnls = 1
0dbfs = 1

instr 1

kenvelopemod linseg 0, 2, p4, p3-4, p4, 2, 0

kFreqMod expseg 200, p3, 800
amodulator oscil kenvelopemod, kFreqMod, 2

acarf phasor 440
ifn = 1
ixmode = 1
ixoff = 0
iwrap = 1
acarrier tablei acarf+amodulator, ifn, ixmode, ixoff, iwrap

kgenenvelop linseg 0, 0.5, 0.3, p3-1, 0.3, 0.5, 0
out acarrier * kgenenvelop

endin

</CsInstruments>

<CsScore>

f1 0 4096 10 1
f2 0 4096 10 1 0.3 0.5 0.24 0.56 0.367

i1 0 5 0.2 
e
</CsScore>

</CsoundSynthesizer>

See also

Orchestra Header Statements