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Here are some tips before connecting wolfson pi audio card with raspberry pi.
How to connect the Wolfson Audio Card to Raspberry Pi
This Wolfson soundcard has been designed to plug in to Raspberry Pi simply and easily. It is compatible with Raspberry Pi Models A and B Hardware Revision 2.0 boards, which feature the 8 pin audio GPIO connector, known as P5, and located right next to the GPIO header as show below.
Raspberry Pi with P5 connector outlined in red
It uses innovative sprung connectors to connect with Raspberry Pi. This avoids the need to solder an 8 pin header to your Raspberry Pi, thus making installation quick and easy.
a. Ensure the eight pads on connector P5 on Raspberry Pi are free of dirt and grease. If necessary, use a little degreaser, such as a very small amount of detergent on a lightly dampened paper towel, and wipe the eight pads clean. Leave them to dry thoroughly.
b. If necessary, repeat the process with the sprung connectors on the soundcard.
c. Locate the nylon pillar in the box contents, screw it into the mounting hole shown in the image below, and tighten. Don’t over tighten.
d. Push the soundcard onto Raspberry Pi, making sure the board is pressed all the way, and that all eight pins have made contact with Rasp pi .