I'm sure some of you are aware of this, but for those who don't, PluginBoutique are offering Acon's Acoustica 6 Basic Edition for free:
https://www.pluginboutique.com/product/3-Studio-Tools/48-Audio-Editor/1956-Acoustica-6-Basic-Edition
Using scook's excellent ToolEditor (https://docs.google.com/document/d/1eiVH_I1clbbRtWFh4-3Mo7HANjCxR8SwqHJtYXy19gw/pub ), you can add this to your tools editor to edit audio within CbB:
The settings for the ToolEditor are as follows: