Denoiser Premiere Pro Cs6 ((free))

Duplicate your clip onto Video Track 2. Apply a slight blur to the bottom layer (V1) to hide noise, then use the Luma Key on the top layer (V2) to only show highlights, preserving some original detail over the smoothed shadows.

CS6 actually includes a dedicated effect, though it is less intuitive than modern versions. denoiser premiere pro cs6

Premiere Pro CS6 includes a built-in effect for audio, though it is known for being temperamental. Duplicate your clip onto Video Track 2

Assuming you are using a standard Denoiser plugin (like Neat Video) compatible with CS6, follow this workflow: follow this workflow: