United Plugins released a new audio plugin that is on sale for $30 US until April 5 (regular price $100). Autoformer combines an analogue like pre-amp with automatic volume function and a gentle compressor. I find that this all-in-one plugin is light on CPU and introduces no noticeable latency. I am using Autoformer in front of the GP mixer to balance my multi- keyboard mix for live performance. So far, very pleased with the result.
Here is the link: https://www.unitedplugins.com/Autoformer/