Welcome to Weather-Above
USB Creative external sound Blaster
This soundcard was very easy to install all I needed was to plug in the audio cable coming from the lightning sensor amplifier board, then plugging it in the USB port into the PC, As soon as you start the lightning software. It picks up the audio signal coming from the amplifier board  I definitely recommend using this type of soundcard.  It made the installation a lot easier, you can pick up this type of soundcard from eBay

Update 27/01/2010/ whether computer has been updated we are now using the on-board sound card instead of the USB external soundcard