Way behind you on that. I'm still repairing/cleaning motors properly, I can do the basic electrics but electronicary is way a way. Track voltage to me is a case of it's either there or it ain't . Moreover I still use clipper and Duette which have variable resistance and wave switches. I need to get one triple turn out to complete the layout, I like those very compact.I know it's not everyone's cup of tea, but personally I found DCC to be an absolute eye opener, and greatly enhanced my pleasure in playing trains. The addition of sound was an even greater revelation. Brake squeal as you pull to a halt is thing of marvel.
The idea behind it makes so much more sense than trying to regulate the track voltage or PWM frequency. I put a DCC decoder on a 45 year old Triang-Hornby Hymek and it was like new again in terms of performance.
I'd recommend it to anyone.