I hear this a lot but such a perspective elides the novelty (and the actual question):
If I devise a mechanical device that semi-faithfully creates marks that convey information about a conversation - but which does not offer a way to replay the conversation whatsoever - does that constitute a recording subject to two-party consent?
If so, how does this relate to a potential decision to write notes about a call right after as a memo/in my diary?
If so, how does this relate to having my secretary record the conversation in shorthand while listening furtively to the conversation?