When recording with vdat, this device makes it possible to record from an output directly back in an input of the same vdat without having to pull out another vdat to record.
It is a simple stereo feedback module, which can also be used in similar situations (everytime the dialog "recursion not possible" comes up).
There are two modules provided in the package:
one simple feedback module and one with a notepad integrated for writing comments.
Feedback is provided as single download, too.