Disk Writer Drivers
-------------------
These drivers work on any machine, since the generated sound is not
sent to hardware, but written in a file. Disk writer drivers only
support software mixing.
`drv_raw'
This driver outputs the sound date in a file by default named
`music.raw' in the current directory. The file has no header and
only contains the sound output.
`drv_wav'
This driver outputs the sound data in a RIFF WAVE file by default
named `music.wav' in the current directory.