Mid-Side Processing是專業Mastering慣用的伎倆，它可以讓最後的成品聽起來更飽滿，更寬廣，卻不會損壞音質，看看人家怎麼做吧！
示範影片一：使用Brainworx bx_XL
Mastering a rock track in M/S with bx_XL. 10 minutes from a mix to a final master.
示範影片二：在Propellerhead Reason/Record裡的作法
When it comes to mastering, one of the hottest things right now is a technique known as "mid-side processing." As a basic description, mid-side processing uses phase cancellation tricks to isolate the mono information in a mix (bass, vocal, kick drum) from the stereo items (guitars, keys, effects) and then lets you master them separately and recombine them for a very nice sounding master.
This week I brought in two special guests to help me design a mid-side mastering patch for you as well as to help describe the technical intricacies of how this is done. Be sure to visit the links in this video, download the patches, and visit the websites I mention.
http://www.propellerheads.se/stuff/JB...
http://www.peff.com
http://web.mac.com/gilesreaves/Giles_...
http://southern.bandcamp.com/track/he...
Big thanks to Kurt Kurasaki, Giles Reaves, and Southern.
示範影片三：使用iZotope Ozone 4
Mid/Side processing involves working independently with the sum and difference of the left/right channels of a stereo mix. We'll show you how to use the Mid/Side processing in Ozone 4 to get unprecedented control over your sound scape.
Ozone 4 is a plug-in for RTAS/AS, AU, VST, MAS and DirectX hosts.
Check out your own free 10-day trial of Ozone 4 at:
http://izotope.com/products/audio/ozone/
Mid-Side Processing的概念：
1.將原本的左右聲道加總合成一個Mono音軌，由於左右聲道皆含中央訊號(如Vocal、小鼓、大鼓、Bass)，加總後中央訊號會增強為兩倍，成為中央訊號強於左右訊號的Mono軌，稱之為Mid音軌
2.將原本的左右聲道其中之一聲相(Phase)設定成反相，加總合成一個Mono音軌，由於聲相相反，加總時左右聲道共有的中央訊號會互相抵銷，形成中央訊號弱於左右訊號的Mono軌，稱之為Side音軌
3.分別對Mid音軌和Side音軌給予不同的EQ和Compressing/Limiting，再將Side音軌還原成Stereo軌，與Mid音軌混合
4.通常Mid音軌低頻會加強，並將Side音軌的低頻削弱
5.可利用SideChain的作法，讓Side音軌的動態，隨著Mid音軌的動態進行自動補償，以協調整體的律動
下面這個pdf檔提供參考：
http://www.bluecataudio.com/Vault/Doc/MidSideProcessing.pdf
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