MOTM

First, you are assuming there is a "system" :)

The reality is that the series was 100 and 900 to put 'placeholders' at the
ends. But, as time went on
I sort of have a little scheme:

100: simple audio procesors
200: reserved
300: oscillators/LFO
400: filters
500: weird
600: reserved
700: no telling
800: DC processors, but the mixer is AC/DC so I stuck it in there
900: misc/utility

Paul S.
workin' on the MOTM-480 filter. Hmmmm..........wonder what THAT is??!? :)