Comment 24 for bug 367151

Normally ControlPotmeter seems to automaticaly comes with controls to set up/down value step by step.
They are named "waveform_zoom_up" "waveform_zoom_down" ...
I tried to use them but it's does not work for the moment.

The skin parser creates the associate buttons (I used <ConfigKey>[Channel1],rate_perm_up</ConfigKey>) before the waveform viewers, and potmeter controls are created on WWaveformViewer constructor. I guess I have to find a better place to create the waveform_zoom controls.

I can easly extend zoom range, but at at some point zooming in will not add details about the audio visualization. At zoom 100% we already display all the information we have in the waveform data.