FCPX to X2Pro to Nuendo!

Dear Forum Experts
I follow the posts and replies of this forum. I have learnt a lot thanks to the replies of experts like Mr. Ronny Courtens, Mr. Ben B, Mr. Tom, Mr. Andreas Kiel and many others. I am amazed by the sincerity, expertise and spontaneity with which the above experts answers questions from everyone. I am a total beginner and have the following problem. I will be grateful if any one could suggest a solution. I thank you for all your support.
I have succeeded in exporting the FCPX Project as FCPXML and then succeeded in generating AAF File using X2Pro. I was able to open them in Nuendo 6. I am describing the scenario below.
I am running Mac OSX 10.9.5 on the MacPro 2013. FCPX (I’m using 10.1.3) is my preferred NLE. But it does not have all the audio plug-ins and effects I need. I do not have ProTools or any other DAW. I use Nuendo (version 6.0) a professional DAW that has some of the plug-ins and effects I need. I saw videos on the Internet that showed how to connect the FCPX NLE and the Nuendo DAW using X2Pro. I did not know at that time that Nuendo is not ‘officially-supported’ by Marquis Broadcast, makers of X2Pro. Further, I did not check to see whether the audio after finishing in Nuendo (adding EQ, compression, time and pitch correction using the plug-ins and effects in Nuendo) could be exported back directly to FCPX or through some other means.

I recorded some computer voices in software called Voice It records at 22050 Hz (half of 44.1kHz). In Compressor 4.1.3, I convert these voices audio files to 48 kHz/16 Bit. I open my project in FCPX 10.1.3 running on OSX 10.9.5 and import video and audio files, including the above converted audio files, select them in the browser in FCPX and drop them into the time line. After editing, I export this project as FCPXML. I open X2Pro and choose the above FCPXML file and the folder to save AAF file that X2Pro generates.

I purchased X2Pro because I needed to bring the relevant audio tracks from FCPX into Nuendo to do time stretch and pitch correct on these computer voices audio files, available under the Process menu in Nuendo. Now I am stuck because the export formats of Nuendo cannot be opened in FCPX. Thus, I cannot use this finished audio as part of my project for delivery.

My questions are: How do I export the finished audio from Nuendo 6 into FCPX: What format should I choose for this export? If I were to color grade the final edit of FCPX in Da Vinci Lite, should it be done before exporting as FCPXML to X2Pro? Ultimately, can I export the finished audio in Nuendo in some format acceptable to FCPX 10.1.3 or Compressor 4.1.3?

Thank you

Ramiah

Export a 16-bit, 48kHz, AIFF (PCM) or WAV file, then bring that into FCPX as a mixed down track for the video. Mute all your video but this mixed down track. Move on from there.