You should have an attorney.
Your attorney should try to keep out evidence that isn't very relevant but which would prejudice the jury against you.
Conspiracy is a dificult and complex issue. There are a number of requirements. There are also defenses based on what your activity was. However, the question you asked was about juries and their prejudices. How you appear can be a factor in their decision. But my experience is the appearance issue is how you appear at trial.
You are going to need an experienced drug defense attorney. You may also need experts regarding the question of possession and trafficing and the cations of an "everyday user" compared to someone who is in the business.
Of some degree of concern is 5the statements contained on the tape. What they were can be used to argue what your involvement was.
See an attorney.
You should probably be careful what you say here. This is not necessarily confidential.
In my experience Jury trials are an absolute 100% crapshoot.
You really never know what they're going to do when they deliberate.
A really experienced trial attorney can take into account that you sound terrible on the tapes and tailor a defense accordingly.