Saturation and distortion are usually used to add bite and roughness to instrumental tracks to help them stand out in a mix. Klanghelm’s IVGI can give you a full spectrum of colors, ranging from subtle saturation and warmth to dirty, grainy distortion. This is a very musical plugin that reacts dynamically to the instrument on which it’s placed, so it doesn’t create any tonal imbalance. You can also control the frequencies that are being saturated to get the detail necessary to make your instruments sound just the way you want.
There is no rule saying that “the producer gets this percentage and the artist gets this percentage.” All of this is negotiable. What is important is that all creators understand and take advantage of what publishing rights have to offer. This involves having a conversation with your collaborators about the publishing percentage owned, and properly registering your share with a collection service like Songtrust. Alternatively, you could be the sole creator and automatically own and register at 100%.