Generate white noise

Bash, 34

dd if=/dev/sda of=file.wav count=1

If you don't want hard drive 'randomness', (a lot slower)

dd if=/dev/random of=file.wav count=9

SPIN, 28

word x=0
repeat
 word[?x]=?x

Bash + ALSA, score:44 (52 chars - (10% + 5%) bonuses)

Longer than the other bash answer, but accepts duration and bitrate. Also adds a reasonably correct header to the file, so should be reasonably portable:

arecord -r$2|head -c44;head -c$[$2*$1] /dev/urandom

Save as a script, chmod +x it and run:

$ ./wav.sh 1 44100 > c.wav
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 44100 Hz, Mono
$ 

Note, .wav output is to stdout, so it must be redirected to a file.

Mathematica 52 - 5 = 47

g exports a white noise .wav file of s seconds and 8000 bps.

g@s_:=Export["p.wav",RandomReal@{-1,1}~Play~{t,0,s}]

---

Example: a 6 second white noise file is exported.

g[6]

p.wav