By the time you read this, Spectrasonics (www.spectrasonics.net) expects to offer its sample-playback plug-in modules in versions that support the Mac OS X Core Audio engine. The company's virtual instruments Stylus, Atmosphere, and Trilogy will be available in Audio Unit format as well as VST, MAS, and RTAS. All OS X versions will be available to registered users as a free download … Through the end of April, Mackie Designs (www.mackie.com) has extended its offer to Soundscape SSHDR-1 and E-mu/Ensoniq Paris workstation users, who will receive a $2,499 rebate to upgrade to Soundscape 32 … BitHeadz (www.bitheadz.com) has released a version 3.0.5 update for all software in its Unity product line. The upgrade fixes assorted bugs, and it features more reliable MIDI processing when used with MOTU Digital Performer. The update is a free download for registered users … Gefen, Inc. (www.gefen.com) has moved its sound-effects search software, SFX Search, to the Web. The utility offers a new interface and additional libraries … Dan Dean Productions (www.dandeanpro.com) now offers its Solo Woodwinds collection in a lite version for Tascam GigaSampler and GigaStudio samplers. The single-CD package provides solo bass clarinet, flute, oboe, English horn, and piccolo in an affordable ($199) package … Digigram (www.digigram.com) is offering open-source licensing for its line of VX sound cards in order to port drivers to Linux-based computers, handheld units, and other devices with embedded operating systems.