Would have been beeping

Question

I would just like to know if this is idiomatic?

If that machine were broken, that would have been beeping since I turned it on.

Answer 1

Would have been beeping is idiomatic (though would have beeped would also fit).

That in the second clause isn't idiomatic, unless you are referring to something different from the machine, eg you're pointing to a part of it. It would be expected.