In scratch there is a secret sensing block that shows the slider value and and the sensor value. Go to the sensing blocks. Go to slider sensor value. Right click and a small menu will say help and show scratch board watcher. Click on the board watcher and a a block or menu will pop up. I don't know what it does yet but if it does anything let me know. Scratch on!
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That block is for getting values from the Pico Board, which is an accessory that you can buy that allows your Scratch projects to sense real world inputs. See this thread
http://scratch.mit.edu/forums/viewtopic.php?id=6403
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