BobF
Here's the T4 shell. This functionality is no longer usable? Did you really take away the ability to use monitoring tools in a MASTERING tool?

We're not taking anything away in T-RackS version 4.x. ARC integration, however, is not part of T-RackS 5 Standalone (there will be no ARC button there).
If you'd like to use ARC for your mixes and masters, you can use T-RackS 5 in your DAW for critical listening. After export, you can do your album assembly and such as you would by using the T-RackS 5 Standalone if you wish.