Increasing SustainĬompression is also often used to give an instrument more sustain, like a lead or bass guitar. Simply don’t apply the make-up gain and the compression will reduce the part of the signal after the initial attack. This very same technique can also be applied to cut the reverb of an instrument. This way the bass drum maintains its natural feel. Notice that the compression effect is fairly subtle (at least to my ears) which is due to a low compression ratio and a threshold that only affects the signal directly below the peaks of the signal.
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In the context of the full drum track, the bass drum now sounds clearer and stands out a little more. Notice that there seems to be a little bit more ‘smack’ sound to the bass drum now. I used a compressor with 10ms attack time and 400ms release time and a ratio of 1:2. In the context of the full drum track, this is what our uncompressed bass drum sounds like: To be honest, I do not find the bass drum to be too terribly flat, but let’s assume we want to increase the attack a little bit anyways. Here is the bass drum track we will be working with. Let’s have a listen to an actual example! We then raise the entire signal by using the appropriate make-up gain and therefore end up with a signal with an increased attack :) Be careful not to clip your signal when applying the make-up gain. Note that only the part of the signal after the initial attack is being compressed. The release time is set to be long enough for the trailing part of the signal to be compressed, but not so long that the compressor is still active when the next note on the bass is struck. Because we do not want to compress/reduce this initial peak, we set the attack time to the duration of this peak, if not a little bit longer. We set the thresold so that this attack crosses the threshold and thus triggers our compressor. The signal will have a natural peak when the bass is being struck. Instead, it gradually reduces the compression ratio until it reaches 1:1 again. When the sound drops back below the threshold, the compressor does not instantly stop compressing the sound. Instead, the compression ratio increaeses gradually from 1:1 to the maximum within a certain amount of time. When a sound overshoots the volume threshold, the compressor does not instantly apply the full compression to the overshooting signal. Today we will be looking at the attack and release parameters. In the first part we have covered the volume threshold, compression ratio, and make-up gain parameters of the compressor. If you already know all the basics, read on :)
If you are not yet familiar with what a compressor is and what it is used for, I suggest you have a look at the first part of this tutorial, ‘compression – controlling dynamics’. It’s been a busy Christmas period, but as promised, here is the second half of my compression tutorial!
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