Check the thread at:
The issue is that Cubase has a preference to either return to start on stop or to stop at the current position. It does not have a pause function. There are some “sort of” workarounds mentioned in the thread, depending on the setting used for the preference, but the bottom line is that Cubase still does not have a dedicated pause function, so you can only map Stop and have the behavior you’ve chosen in the preferences. (The pressing Stop twice as mentioned elsewhere in this thread was one of the workarounds, but I think may have depended on using one specific preference setting and which key you are using to execute the stop function.) Unfortunately, you can’t map a function that doesn’t exist. 