Can I plot this bar graph?

[Gene Beidl]

I need to bar graph to display an audio signal (similar to Camtasia's display) with axes where I can control the width of the bars depending on the zoom level.  Additionally, I need to add variable width, movable markers along the graph.  These markers need to be linked to specific times in the audio signal and contain other meta data.

Here's a picture of something similar.  I need to be able to scale the y axis, but the x axis would need the scrollbar depending on zoom level.  I don't want the vertical scrollbar as everything should fit vertically.  Additionally, I'd like to change the style of the scrollbars.

Is this possible with PyQtGraph as is?  Or would subclassing the relevant classes allow me to do what I need?

Thanks!