It’s so important to get the non-linear modeling right if we would like to have a sort of analog feel in the digital domain. I can’t stress this ever enough since it still seems to be a common practise in todays audio plug-in design to just throw in a static waveshaper, oversample it and hope this will make everything alright. Not! Even worse, in a recently released plug-in I saw the static waveshapers curve not being continuous again and I’m not going to talk about the sound.
But what should one expect to hear if the analog modeling is just done right? Only by driving the gain of the unit but way before we notice the obvious distortions there appear different by-products caused by circuit side-effects. Depending on the actual device, circuit and components, it might be that the signal starts just getting thicker and more mid-focused, as an example. Or, the signal might appear much deeper and bigger in other cases.
Whatever it might be in particular, I do call this the “Mojo” of the device – it’s not the primary intention of the device but turns out to be a sort of an added sugar. Such effects are highly frequency, transient and gain structure dependent and this is what makes the processed signal to be much more vibrant and alive. Furthermore, the obvious harmonic distortions are not introduced abruptly but they emerge gradually.