Filter PWM and 2-Tone put into a real synthesizing tracker, would allow to play SID-Tunes with real basses. RMT 1.31 allows a lot comfort to handle Filter PWM, even if the timing in RMT is horrible (as a guy who is using the available software, I had to learn to be thankful for every blessing ;) ) . To say it in other words: The degree of available Software is still horrid. 2-Tone needs every single step to be handled and could be an automatism in the tracker. Similar to the Filter voice...
Reaching results like this in the last vid is close to miracles. Funny enough, you don't see the expense, because you don't care about PoKey music. Using 2 POKEYs and/or a lot of CPU time might give wanted results easily. So I understand why you don't get the point.
In this short tune, I added several different timings to any note, just to enhance the note "expression". IMHO is this tune a good demonstration how PWM enhances the musical resolution. Just imagine how things could sound, if it was possible to set the PWM spread directly....