I recorded some old cassette tapes at 11025 bps in mono. The recorder ran for several minutes after the tapes ended, so I imported the file into WavePad (free version 1.2), deleted the silent ' tail', and saved the file. I was surprised to find that the file had ballooned from about 5MB to over 130MB!
Reloading the file showed that it had been converted into 44000 bps stereo. I used the File menu to change the sample rate back to 11025 mono, resaved it and again found it had been converted back to 44000 bps stereo!
I found a suggestion on this forum to use Save As... instead of just Save. This worked as it gave a choice of sample rate after renaming the file. On reloading, the file is now 11025 bps mono as desired, but even with the extra minutes deleted, it is still about twice the size (10 MB) as the original.
Why does this happen? Is it because I am using the free version? How can I get rid of those extra minutes and make the file smaller?