KMix mousewheel bug workaround

There’s a bug in Kmix (I’m running KDE 4.10.3) which causes the mousewheel to increment 15% rather than a more sensible 5% as normal. Add VolumePercentageStep=1.6666 to the file ~/.kde4/share/config/kmixrc and all should be well. Close and reopen kmix, or logout then back in and all will be well 🙂