If you want a denoiser an excellent one is izotope rx2. You can run a bounced wave from reason through it in standalone mode and then import back into reason.
I reckon we will see a dedicated multiband compressor as a re soon. Of course a mbcompressor can be configured to act as a de-Esser also.
The bad news is you pretty much have to be a rocket scientist to work a multiband comp properly without screwing up.
Last edited by Kaimata; 2012-10-17 at 10:28.