Now that's way too much for me, so here's how to give yourself finer control of Kmix's volume changes.
- Close and quit Kmix.
- Open the file ~/.kde/share/config/kmixrc
- In the [Global] section, add this line:
VolumePercentageStep=1.0 - Close the file.
- Open Kmix
- Enjoy
The 1.0 supposedly means 1.0%, but don't call me on that one.