I know this is probably an easy question, but what does

"240Hz/(N + 1)" mean (regarding envelope decay)?

I know the amplitude decreases at a rate of "240Hz / (N + 1)". What are the units?

If N was 4, does it mean that I would decrease my amplitude by one every "240/(4+1) = 48" clock ticks (of the 1790000 that occur every second)?