Another use of TRK SOUNDS is to build complex sounds using 4 layers…so multitimbral…
With a bit of careful programming you can go to very interesting timbres…since this already happens with just one Track!!
Otherwise you can go UNISON in a different way from the default of the machine, where you only decide spread and detune.
Think of copy T1 sound to T2 till T4.
Then make small adjustments between the Tracks and using TRK SOUNDS plus UNISON will get you to whatever big sound