Hi all! I'm writing again about this issue, and am attaching a link to a sample MP3 file from setBfree. There is a problem with the sound. The Rotary speaker sounds as if both rotors were small fan-type baffles in front of the speakers. There's almost no drum rotor at all, just stationary tone, and the horn rotor sounds a bit small with mostly straight sound. http://www.sendspace.com/file/3o7fyp The demo file begins with rotors off, then goes to slow, then fast, etc. There is a slight glitch in the recording, and the pitch of the recording itself is wrong for another reason, neither of which is setBfree's fault. I've tried the default settings, the default.cfg file that came with the package with the options set to read it, uncommented the whirl parameters as they were, and modifying some of them, but can't get much satisfaction. I didn't specify the zitaconvolver option in the make process, but the libzitaconvolver is there. I didn't supply any IR files yet, as I didn't think the convolver was in play, although the status at the top of the setBfree screen did mention IR I believe. Would the problem have anything to do with my system being 64-bit? Or did I make some other mistake in the install process? It definitely doesn't sound like the supplied demo. If more info is needed, please let me know. I'm not extremely experienced in making and installing, but I do try to follow instructions. Thanks for your help. Kevin