Variables in CSound

Types of variables

There are three types of variables in Csound: i-variables, k-rate variable and a-rate variables.

i-variables are set when an instrument starts to play and are not changed. These variables must start with the letter i.

k-rate variables are changed with the k-rate (see kr).

a-rate variables are changed with the a-rate (see sr).

Actually, there are more than three types of variables: each type can be global, in which case the variable name must be preceeded by a g.

sr = 44100
kr = 4410

nchnls = 1

instr 1
  ilen = p3

  kvel  line 0, ilen, 3

  ksig tablei kvel, 1
  asig = ksig
  out asig*32000

endin

f1  0  4  7   0  4  1

i1 0    0.0009070294   ; With audio rate 44100, the length is 40

This setup produces:

Now, the orc file is slightly changed:

sr = 44100
kr = 4410

nchnls = 1

instr 1
  ilen = p3

  kvel  line 0, ilen, 3

  asig tablei kvel, 1
  out asig*32000

endin

This orchestra produces a totally different output:


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