Emulating the FATSO
The FATSO is often used to warm up digital recordings. The FATSO emulates Tape saturation, does high-frequency compression, creates low-frequency harmonics, and does leveling compression.1 Marc Daniel Nelson says the warmth circuit is basically like a de-esser.2
For the first process, try something like Satin or Wow Control.
For the second process, try something like the high-frequency limiter on Limiter 6.3 Empirical Labs call it a dynamic low-pass filter, which I could make in Volcano 3.1
For the third process, try something like a low-mid band with Saturn 2 using one of its transformer modes.
Finish it off with a leveling compressor like MJUC or Pro-C 2.
Notes mentioning this note
Controlling harsh high end
Controlling harsh high end Balance a cut with a boost, e.g. a cut at 5kHz and a boost at 15kHz.1...
How to treat sibilants
How to treat sibilants
[[Volume automate sibilants]]
[[Use Melodyne to treat sibilants]]
[[Emulating the FATSO]]