1. When assigning an input filter to PRESET POOL.
it only affect the preset created thereafter, it won't affect the presets created before.
This add in more confusion if there are changes in input filter thereafter to the preset pool.
2. Seems applying INPUT FILTER to a PRESET created before does not work.
with reference to
This is normal, and is no different from how Input Filters or PresetFilter work on grandMA2. An Input Filter changes what you can add or modify moving forward, not what is already in the object. Otherwise what would be the point of being able to temporarily turn off PresetFilter in gMA2? Changing or applying an Input Filter to a Preset or Preset Pool in gMA3 is essentially applying a custom PresetFilter (in gMA2 terminology) to that Preset or Preset Pool.
Thanks for your explanation, Ryan. : )