I agree with Jeff. Mistakes are allowed, but you really ought to have done some homework on what the Voice Memo app could do, especially considering that it was free and accessible to you, and that the official docs by Apple have it written out. That's the basic responsibility of any good reviewer.
The proper practice for tech reviewers when mistakes are made is to append an "Update: correction" or "Edit: correction" at the end of the article, and NOT to reply on making users dig through the discussion in the comments to find it.
iTalk vs. Voice Memo
iTalk vs. Voice Memo