Out of curiosity, you filed the appeal yourself and don't have an attorney?

Was there a reason you didn't try to obtain the audio prior to filing your appeal?

At this point, I'm not sure if you should overly stress about the audio from the ALJ hearing. It's probably a good idea to obtain and make notes while it's still fresh in your mind, but at this point, there's not much you can do with the information. And depending on what happens with later on, it may never be relevant in the future.

If your appeal is successful, than it's most likely that your case will be remanded to another ALJ hearing--which gives you another opportunity to prove your case and you can even obtain new medical documentation to strengthen your case.

If your appeal is denied and you choose to pursue a federal case, than you'll need to find solid legal representation, and at that point inconsistencies between the recording and the transcript could come into play, but that is truly a worst case scenario.

I hope this makes sense.