PE6 is only allowing me to narrate one photo
What I think you are experiencing is that the PSE slide show is automatically increasing the duration of the slide that you had selected when you started the narration. It is acting on the premise that you are narrating for that specific slide: that seems to be a variation on the Organizer concept of having an audio caption that is related to a photo. In fact you also have the option of saving this narration as an "audio caption" that is related to that photo file.
So you might end the first narration and then select the next slide and start narration you wanted at the time of the next slide. HOWEVER, I do have concerns that this might not sound very smooth in playback.
I can not even find the way to control the volume.
I find it difficult to believe that PE6 would not allow for continual narration all the way through the slideshow.
Unfortunately the audio functions in the PSE slide show are very, very basic. If you do not have music in this slide show at the same time as you are narrating, you might try recording your narration using Windows and then adding the resulting .wav file to the slide show as an audio file.
BETTER YET, I wonder if you could do the narration in Sony Vegas ? - since you say you already have plans to add an audio track using Vegas. I have Adobe Premiere Elements for video editing and DVD creation and there have been times when I add audio for my Photoshop Elements slide show after I had taken it to Premiere Elements.
Do I need to save the slideshow in PE6 as jpeg or as psd?
I don't know what formats Vegas accepts as input - so hopefully someone else here will comment.
However, you can't save a slide show as a jpeg or a PSD: it is no longer a photo: it has other attributes such as duration, potentially movement from pans and zooms and transitions.
The normal output formats from the PSE slide show editor are :
-- a WMV compressed video file OR
-- a PDF file, but the PDF format has limitations like no pan or zoom