You must be “converting” it in the wrong way.
To change the sample rate of an Audacity track without changing the pitch or the length, you need to “Resample” the track.
Example (assuming that you’ve not changed the default sample rate from 44100):
- Launch Audacity
- Generate a 440 Hz Tone (“Generate” menu), 10 seconds duration.
- Play it and observe that the pitch is “A 440”, 10 seconds duration, and the track sample rate is 44100.
- With the track selected, “Tracks menu > Resample: → 48000”
- Play it and observe that the pitch is still “A 440”, 10 seconds duration, and the track sample rate is 48000.
That’s the correct way to resample a track, though usually you do not need to do that manually because Audacity will automatically resample to the “Project Rate” on Export.
(The “Project Rate” is in the bottom left corner of the main Audacity window.)
See this announcement: Time Shift Tool (F5) removed
See:
https://www.audacityteam.org/2-minute-survey-about-new-features/
This is a community forum, run by people that use Audacity for the benefit of people that use Audacity. I don’t think that we carry much influence these days as the new management prefer to use surveys. In the past, we would log feature requests, and write up proposals for the most popular.
Here are some that have been implemented to some extent (indicated by the green ticks):
and some proposals that have been implemented: