I don't use the hpf and have not really played w/ the limiter - I thought these two firmware revisions fixed the hpf and bad clipping behavior problem.
1.67
fixed - bad overload behavior from 1.60 fixed
fixed - CF no longer erroneously shows "full" after deleting files and emptying trash with a Mac
fixed - time remaining now changes properly with ext word clock
fixed - linked units now advance take simultaneously with file split
fixed - user bits now properly track take number on both hard drive and compact flash
changed - FireWire screen now says "...don't disconnect firewire cable..."
added - upon update, it now prompts the user to update the date/time
released March 24, 1006
1.60
fixed - Media Repair utility no longer flags good files as being bad.
fixed - A/D offset fix (high-pass filter, implemented in v1.57/1.58) is now applied only to analog inputs, not digital inputs.
changed - default maximum file size is now 2 GB.
released December 28, 2005