Hi all, After long painful work, I finally got filter behaviour simulation feature working. It can currently simulate all following filter types: Lowpass and highpass, (Butterworth, Bessel or Linkwitz-Riley). Orders 1 thru 10, except for Linkwitz-Riley, which is always of order 4, regardless of the input field. Allpass filter, first and second order. Linkwitz transform (My favourite!). Parametric eq with specifiable Q, Gain and center frequency. High-Q second order highpass, with specifiable peak magnitude and frequency. Nice thing about this filter simulation feature is that you can compile any arbitary combination of above, or multiple instances of any filter type (although not all combinations make sense that way). Impact of the filter is shown on magnitude, phase, group delay, SPL and cone excursion graphs. There are also number of other changes, but there are just too many to include them all here. See versions.txt included in zip-file instead. To test this new pre-release, you'll need 0.50a6 installed already. You can download it from our website, www.linearteam.org. Then, unzip the zip file in top of that installation directory. Thanks for your time to test this new upcoming release, there might be major new features/changes before "official" release. And finally, error checking is currently minimal, so use filter feature with caution, it is easy to crash it with bogus parameters. Download zipped new executable and versions.txt here With Best Regards, Janne / Linearteam Edit: Fixed download file name, perhaps to fix download problem which people have been experiencing. Edit2: Updated link.