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PowerPoint allows you to record an entire presentation with audio and animation timings synced, but you cannot re-record both for an individual slide.
For instance, let's say I recorded a 40-minute talk over 20 slides. I messed something up on slide #17, which has audio and animation on it. I just want to re-record slide #17 without changing the rest of the recording.
(You can replace the audio, but even that's cumbersome.)
I felt like a genius when I realized I could copy the slide I wanted to re-record to a new PowerPoint, record the entire presentation (which is just one slide), and then copy and paste that back into the much larger presentation.
In PowerPoint it is possible to re-record a single (or multiple) slides in an existing series of recordings. By clicking on the dropdown option under Slide Show > Record Slide Show, and to choose for Record from Current Slide.... When the presenter view pops up, you can click on record, and re-record both the transition and audio (and even video if you have that enabled) for the current slide, and also any slides after that.
This keeps all slides that you do not touch (i.e. all slides that you do not revisit in presenter mode) intact, along with their timings, and previously recorded audio and video.
Even simpler, move the slide you want to re-record at the end of the presentation. Use the "record from Current slide" option, which will just record this last slide. Then move the slide back to its initial position.
Even easier. Once in the record from current slide option. Clear recording from current slide and re-record. Once done, hit stop. the other slides will be unaffected.
