Dynamics processors are essential when recording, mixing and editing music. But when it comes to compressing an entire sum signal, a lot of digital compressors turn out to be unusable, many of them were made to process single-track signals only.
On complex sources they tend to produce a 'pumping' sound, distort or just make your music lifeless. There are manufacturers telling you 'this is the only compressor you'll ever need'. Don't believe them. Sound signals are far too complex to be handled by a single device.
Your music deserves care and attention to Details. This applies especially to the post-mixdown stage, often referred to as 'mastering'.
Endorphin is no universal talent either.
It is a specialist for complex sources like a mixdown, after having made minor sonic adjustments and right before burning the track to CD.
Furthermore, it can help to increase depth, definition and loudness of a track.
I call it an 'analog-style' compressor: endorphin uses models like Frequency-dependent nonlinear operation, different harmonics creation stages as well as two basic compressor circuits taken from the analog realm.