Strange questions but worth asking: do new firmware updates ONLY add to the existing sound library i.e.. amps, fx, etc. or do they also remove and/or replace? I seem to recall an early update that changed/replaced some factory presets rather than simply adding new presets but I don't recall if this also applied to the factory sound library as well. Unfortunately, I've not checked this myself with the past couple of updates. Essentially, I'm wondering if the latest firmware 2.50 that includes new amp models, HX and Legacy effects will simply be added to the library or replace anything that currently exists.