A simple introduction to Linux Csound's real-time usage can be presented by defining an instrument (a simple oscillator), creating it in a text editor and saving it as my.orc:
sr=22050 ; sets sampling rate kr=441 ; sets control rate for k-rate components ksmps=50 ; sr/kr, number of samples per control ; period nchnls=1 ; monaural output instr 1 kamp = 10000 ; raw amplitude kfreq = 440 ; an A at 440 cps ifn = 1 ; stored function table 1 asig oscil kamp, kfreq, ifn ; an audio signal is ; created by an oscillator playing ; a stored sine wave at kamp and kfreq out asig ; the audio signal is sent out endinNext, we write another file called my.sco. When compiled, the score will be played by the instrument:
f1 0 8192 10 1 ; stored sine wave i1 0 3 ; instrument 1 plays for 3 seconds, ; start time at 0 eWe then compile our orc/sco files into a sound file:
csound -omy.wav -W my.orc my.sco ; creates a WAV format sound fileCsound will create the sound file, the user can play it with vplay or any other WAV player and it can be edited by MiXViews, DAP, Snd or any other Linux sound file editor.
If we wish to send the sound output directly to the sound card DAC, we use this command:
csound -o devaudio -W -dm6 my.orc my.scowhere:
csound -iADC -oDAC -W -dm6 inout.orc inout.scowhere: