/b_write					Write sound file data

int    - buffer number
string - path name of a sound file
string - header format
string - sample format
int    - number of frames to write (optional. default = -1, see below)
int    - starting frame in buffer (optional. default = 0)
int    - leave file open (optional. default = 0)
bytes  - an OSC message to execute upon completion (optional)

Write a buffer as a sound file.  

Header format is one of: "aiff", "next", "wav", "ircam"", "raw" 

Sample format is one of: "int8", "int16", "int24", "int32", "float",
"double", "mulaw", "alaw"

Not all combinations of header format and sample format are possible.
If number of frames is less than zero, all samples from the starting
frame to the end of the buffer are written.  If opening a file to be
used by DiskOut ugen then you will want to set "leave file open" to
one, otherwise set it to zero. If "leave file open" is set to one then
the file is created, but no frames are written until the DiskOut ugen
does so.

Asynchronous. Replies to sender with /done when complete.