- The first option can be `none' or `all'.
- `none' is a synonym for `nonative,nonas,noesd'.
- `all' is a synonym for native,nas,esd or `all'.
- The default is to autodetect all sound support.
+ The first type can be `none' or `all'. `none' means
+ `nonative,nonas,noesd'. `all' means `native,nas,esd'.
+ Later options override earlier ones for the same TYPE.
+ Autodetect native and NAS sound unless specified.
+ ESD must be explicitly requested.