Finding slice index

Hi vvvorum
Silly question: how can I get slice number (index) which changed its value in a spread?

https://vvvv.org/sites/default/files/imagecache/large/images/0_2015.06.27-15.08.18.png
Guest2

er even like this using fromer index of Select:

https://vvvv.org/sites/default/files/imagecache/large/images/0_2015.06.27-18.17.21.png

Thanks guest and tonfilm, that’s what I needed!