Just visit a dutch site I created for my retailer: http://www.keyboard-centrum.nl/

Then select "Assortiment" in the top navigation and subsequently "Accessoires" on the left. Finally click at the bottom of that page on the link. Then you get to the page of extension board and behins each picture is an mp3 that I created ....with Technics Audio Recorder, saving as mp3.

Regards, Fred