This technique (thanks Yep and Paul Frindle) has made a very noticeable difference in my mixes...
I wish I had stopped drinking the "it doesn't matter as long as the master isn't clipping" kool-aid a lot sooner. Sure that may be the case with a simple null test using ReaPlugs only, but in practice headroom is important, digital or not.
There's a reason mixers have trim, and I really wish Reaper's did too.
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