One effective way to do this is by adjusting the mid-range frequencies on your EQ until they balance out the high frequency noise. EQ can be used to fix a lot of sonic problems like these, as well as removing hum or unwanted harmonics. Polish that Diamond Compressors act as a gate, and can really help you get a more professional sound by controlling the volume and keeping it within a specific range. This means that if your recording suddenly gets louder, it won't stick out. If your editor offers this feature, I recommend using it as the last step in the process.
Most compressors have three main controls - threshold, attack and decay.
Threshold is the cutoff point for sounds, and creates a ceiling for its dynamics. Attack determines how quickly the sound will be cut off. A quick attack will create a hard break, while a slower one with be softer. This effect is heard at the beginning of the sound cuttoff. Decay involves how fast or slowly the sound is allowed to normalize, and comes at the end as the sound level drops below the threshold.