Raz Audio has released  M/S controller, a VST for Windows. They say that it's the ideal tool for mixing, mastering or DJ & PA work and gives you easy control of Mid ('phantom center') or sides content. Here's the full story in Raz Audio's own words...

An intuitive GUI provides you only what you need - clear easy knobs and value readings, with precision level bars for each channel (L/R and M/S). Based on floating point calculation, the M/S controller is an accurate and true to the original material. Expect zero artifacts.

The M/S controller becomes very handy in these scenarios:

Common:

• Punchier kick/drum response for dance clubs effects
• Bring out the lead vocal and instrument for DJ/PA venues
• 'Karaoke' like effects - in which the leading vocals are attenuated to zero
• Set as a 'send FX' (not 'insert') in series to a reverb unit and attenuate 'Mid' (or enhance 'sides') - for receiving a spacious, lustful reverb effect, which is still vivid and clear

Advanced techniques:
Use the M/S controller for a full separation of Mid over side and export each track for advanced processing:

• EQ: Roll off the low-end content of sides to provide a tight, powerful mix
• Provide different compression or EQ setting to 'Sides', prior to sending the signal to a reverb unit, for a clear and clean result
• Provide any different process for lead vocals and background

Pricing and Availability:
Free download

More information:

• M/S controller

• Free EQ Plug-In 19-Mar-14