If they do, they're not particularly clear about them. Every app developer would love for Apple to post a page that CLEARLY lists rules and guidelines for submission and reasons for rejection. 4 submissions delayed our app hitting the market by about 2 months.
Thank god we have another sound board, I am so happy that you got this amazing app through. Maybe the app reviewers were giving you a hint, like do we really need another sound board. Surely >1000 is enough?