Sion Software's QuickScore Elite Level II 2008 (Win Vista/XP/NT/9x; $179.95) supports real-time VST effects for audio tracks. QuickScore Elite is music composition software with notation, arranging, and MIDI and audio-editing and recording capability. Version 1.7 of the software allows you to control, adjust, and audition effects easily in real-time. It supports effects that require multiple passes.
Registered users of earlier versions of QuickScore can upgrade to QuickScore Elite Level II 2008 for $99.95. For more information, visit www.sionsoft.com.