Best practice for recording narration in sync

My workflow:

I have also started most projects with a PowerPoint file. Early on I expected not to rebuild content in Captivate, but in most cases it has been beneficial to have the material in Captivate for illustration and animation purposes.

I've been recording audio with Adobe Audition, save a wav, marking chapters that would equate to a Cp slide, then exporting each file as MP3 with a slide number & title for the filename.  This is done on a MacBook. (I understand Audacity may be a workable alternative if you don't have the eLearning suite.)

My Captivate work is done on a Windows 7 Desktop, where I found a tool that will take the wav and companion pkf files and export the chapters as a text file. The audio is bulk imported to the Cp library, which pulls in the file names and makes it easy to locate and replace TTS audio on each slide with the narration I've recorded.

I then sync the content of the slide to the audio, which is contrary than what your planning, but this approach has allowed us to be flexible in our designs, and manage content reviews that occasionally have lagged behind the audio production timeline. This has also been the driver for replacing many of the PowerPoint slides with content created directly in Captivate to manage revisions and to provide animation & visuals to maintain learner interest.