Ok, so hopefully none of you who have tried this experienced the same issues I have with audio. Do NOT purchase the cable that I suggested in my first recommendation.
I've spent quite a lot of time troubleshooting on my phone, Audrey's phone, different scenarios...heck, I even sent my phone into Apple for a replacement thinking the issue was my headphone jack.
I'm narrowing it down to the fact that my splitter is not compatible. I spoke with the Voice Synth crew and they recommend the following splitter:
iPhone 1/8 inch electret condenser microphone and headphone adapter - 3.5mm 4 conductor TRRS Male to 3.5mm TRS Jacks
They have experienced the same audio issues that I have had, and told me that this has proven to work. Only problem is that it's 4x the amount...at $28. STILL, this is a much cheaper solution than a dedicated voice changer (with the option to have multiple voices for other costumes). Just goes to show that the quality of the material is key in this situation.
It should ship to me within 2-4 weeks. I will update with results then. In the meantime, I will continue to make a better sounding Boba