Seeking for Technical Support on iPhone External Acoustic Devices

Recently we are trying to develop a 3D record box enabling users to record stereo radios, which is based on Apple devices. That means our product should include a Lightning accessory compatible to Apple devices. Yet the main problem rises when we do not have enough experience on Lightning accessory designing and operational modes of Lightning Audio Module or Lightning Audio Module 2. We were advised to apply for Accessory Test System devices (including Lightning box and Lightning audio Box) to finish certification test procedures, but we have not gotten an ATS Lightning audio box. We write this email to seek for technical support on develop procedures of Lightning devices made for iPone, especially on using Accessory Test System to analyze the audio packets transmitted through Lightning accessories.