Factored out some code into ScaleAndClip() and ScaleAddAndClip()
Factored out some code into ScaleAndClip() and ScaleAddAndClip()

sbooth/SFBAudioEngine,sbooth/SFBAudioEngine,sbooth/SFBAudioEngine,sonoramac/SFBAudioEngine,sonoramac/SFBAudioEngine,eriser/SFBAudioEngine