It's possible to customize ProChannelFX background image and header background image ("Dark Gate" in the example above). However, it's difficult to create anything interesting to background graphics because image is stretched in undocumented way. It seems like it's stretched to the old FX chain window size.
Because ProChannel is here to stay and Cakewalk is committed to develop more ProChannel modules, I'd like to see some improvements in FX customizing:
* Official information about recommended background image dimensions (197 x 200 pixels?)
* Information about image streching if it's not made customizable (none, tile, center, strech, zoom)
* Enable all the customization option that are currently visible in the context menu but disabled.
* Option to hide unused knobs and buttons.
* Option to set rotary knob X,Y coordinates. Text will follow coordinates.
* Option to show knob values as real values instead of percentages. If knob is connected to multiple items, show values in multiline tooltip.
* Option to save & recall presets.