Increasing speed witout changing the pitch

Hello!

How can I bring my rockboxed Sansa Clip Zip to increase the speed without 
changing the pitch?
I can change the speed with changing the pitch by clicking up and down 
arrow.
Apparently there's also an option for changing the speed without changing 
the pitch by using left and right arrow but for me it doesn't work.
Do I miss a file or a setting to reach this feature?
I've heard it being presented in a podcast, that's why I'd really love to 
have this feature in my player as it's very handy. I'm listening a lot of 
audiobooks and often need an increased speed but don't like it to sound like 
a Chipmunk than.
Thank you very much in advance for any help and suggestions!
Best regards,


Barbara








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