You can use either device but PC version is much better. The only way I can think you can correct ¨mispronunciations¨ is by recording again and then cutting out the part in which you made the mistake and then insert the new recorded piece there, you will need to do a very good good re-recording and cutting and pasting to accomplish a smooth transition between the pieces, you can then save the file in the format you need and play it out to see if the result was what you desired.
You can reach NCH tech team here: https://www.nch.com.au/support/index.html for their input on this.