Hi,
Just started learning Houdini.

I am delaying a reference copy by 6 frames using a timeshift, with the
expression "$FF + 6.0" in the Frame parameter field, which works fine.

but I am trying to control the delay time using a detail attribute i created called "interval".

When i try to use it in the expression, it doesn't work.
like $FF + "(6.0 * @interval)"

Can i use attributes for this?
Or there's a better way to go about 'copy-delaying' something.

Thanks for help,
Yan