funny, when I started with SL this past May 2024, I kept wondering why I’d need waveform display…nowadays, half the work I’m doing in SL, the screen is split about 50/50 because I’ve decided to do levelling and a fair amount of pre-mixing in SL…and you need the waveform display for envelope points…not to mention having each layer color represented in the waveform display…my oh my, the stuff we don’t already know =-D
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Yes, even though it’s not the core of SpectraLayers, the waveform display is still somehow required for some operations and level monitoring.
Fun fact: SpectraLayers 1 (2012) and 2 (2013) did not have any waveform display 
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and, as you said at the audio forensics seminar that waveform display is more accurate for time based display (transient timing)
so cool!
This is classic.
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And perhaps, a future edition of SL Pro could include an additional helpful view of its waveform display, to serve no other purpose than as a cool visual aid. A selectable option (turn on/off) or separate tab view…?
Feature Request: Adding Rainbow Waveform Support - SpectraLayers - Steinberg Forums
The colour/frequency range user-selectable dialog box would be needed too… 
Although a pretty neat tool in WaveLab, I say it’d still have use in SL. Maybe at the very start of a (whole song) project, to quickly help identify areas of interest, needing further investigation/editing/spectral-particular attention…
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Btw: Where can we(users) download old Spectralayers releases (legally)?
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Steinberg website > Downloads > Unsupported Products > SpectraLayers :
SpectraLayers 8 will work with your SL9/10/11 license, but SpectraLayers 6 and 7 were using the previous license system, so they would require a valid eLicense.
SpectraLayers 9 and 10 are still on the main download page, and will work with SpectraLayers 9/10/11 license :
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