[PlanetCCRMA] snd updated to version 6.1, misc

[Fernando Pablo Lopez-Lezcano]

* the Snd sound editor has been updated to version 6.1

* Added instructions on how to install the kernel source and
  headers (at the end of the section that deals with installing
  the kernel and sound drivers).

* Updated the USB Midi Nano HOWTO to include the latest
  "discovery" on how to make the Midisport work :-)

-- Fernando