this way Alexandre posted won't prevent the write pointer of the delay line from advancing, when you unfreeze it will write in another place, and not append where it stopped.
Also on facebook i came with a solution with switching off the delwrite, and then you need to update the time in the delreads if there is anyone reading from that delwrite, i will post the patch, see if you need something like this
this can be used to create very glitchy effects, if you put little things in the delay line and keep freezing and unfreezing