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I found myself getting a little bit frustrated with some of the default colors that would come up in the VIVA waveform tool while I was plotting from the Analog Design Environment (ADE). After working with Kabir, the Product Engineer for VIVA, I discovered that the colors for the waveform defaults are actually being set by ADE. There are a set of probe layers or Y layers in the Display Resource File that ADE cycles through to match up highlighted nets on the schematic with traces in the waveform tool. Setting these colors and line types correctly will define the palette that VIVA will cycle through as it draws traces.
If you are interested in how to set these layer defaults, please watch this short video presentation.