Mon Sep 01, 2014 1:44 am
Hi Steven,
In iZotope RX3, first Normalize the recording (or use the Gain control to increase the amplitude). Then select an area where you just have the blower noise and nothing else. The longer this portion of 'just-blower-noise' is, the better the noise reduction. Now open the Denoise tool and click on the 'Learn' button. Once the Learn has been completed you can deselected the 'just-noise' area so that the whole recording is selected. On the Quality slider, set it to the highest quality - "D". Click on the Advanced Options button.Set Masking to 10 and Whitening to 0. Now move the Reduction slider up until the lowest point of the yellow indicator line hits the 0dB line. Click on the Process button to perform the Noise Reduction. If there is still blower noise present after this first pass, then repeat the process (Learn an area of 'just noise', adjust the Reduction slider), but this time use Quality "C" and set Masking to 7 and Whitening to 3.
These are just guideline settings, as each recording space is different, so experiment a bit and use the 'Compare' feature to see what sounds best to you. Also, use a set of high quality headphones to test the results, speakers and room ambiance can distort things a little.
Kind regards,
GrahamG