thanks @darekk. And sorry I missed your post last year @Manarsoft.
Not the same example as the original post exe (the exe in the original post was meant to be the tutorial rather than the cap itself), but I hope this proves useful.
Drag and Drop 'A' and 'B' and drag the 't' slider to see the 'Lerped' values change. http://tinyurl.com/lerpExample