Sonic Foundry have announced VSTi support in the soon to be released ACID PRO 4.0!!

New in ACID PRO 4.0:

• Plug-In effects automation.
• ASIO driver support.
• 5.1 surround mixing.
• MIDI piano roll editing.
• Yamaha OPT support.
• VSTi support.
• Alternate time signatures.
• Master, auxiliary, and effects bus tracks.
• MIDI event list editing and step recording.
• Loop Cloning, and much more.