Dave, Can I ask you to confirm your initial question on this subject? I want to make sure I understand what we're saying before we get too deep into the math. It seems to me that you've called into question the mathematics behind impulse responses being created for current IBIS-AMI models, and therefore how IBIS-AMI models must be written to process those impulse responses. If there is indeed a problem with the math, it follows that the current standard would need to be either updated or extended, depending on how the details play out. Is that what you're saying? Todd. Todd Westerhoff VP, Software Products Signal Integrity Software Inc. . www.sisoft.com 6 Clock Tower Place . Suite 250 . Maynard, MA 01754 (978) 461-0449 x24 . twesterh@xxxxxxxxxx "I want to live like that" -Sidewalk Prophets