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So let's check out the lowpass filter in ES M. Essentially what a lowpass filter does is it cuts out the high frequencies. So when I take this cutoff control and I move it--so I will play a note-- (music playing) it starts to cut out the high frequencies, and the more that I bring this to the left the less high frequencies there are. And you can see that it's diminishing the amplitude and the shape of the waveform, and I can filter it all the way down to pretty much where it's just silence. (music playing) So the other aspect of this cutoff control that sort of works with it is the Resonance knob.
It's down at the bottom. So what resonance is is it's essentially a little boost wherever the cutoff point is. So if I increase the amount of resonance here, and then I adjust the cutoff, you will hear it kind of stand out of the cutoff point. [00:00:50:24] (music playing) And the more resonance I give it, the more prominent that sound is. (music playing) So you can really hear that ringing out.
So when you have sort of a medium amount of resonance, that's where you can get this squelchy, acidic sound that's common in a lot of electronic music. (music playing) Another way to visualize what that cutoff looks like is to actually look at the channel EQ in Logic. So I am going to set this filter back to its fully open position and turn down the resonance, just so we don't have anything interfering. I will open up the EQ. So what I want to do is use the Analyzer in the channel EQ.
So I can turn that on here. What I want to do is set this to High Resolution. I am also going to adjust the amplitude scaling here just so we can see things a little better. So that now when I play a note-- (music playing) --you can see its harmonic components showing up on the Analyzer. So I can use the lowpass filter that's in this channel EQ to sort of show you what's going on with it. So I engage that here, and then this is my cutoff point. So as I bring this down, we will hear that the high frequencies start to disappear.
All right. I can filter it down in the same way. (music playing) And then to show you sort of what the resonance looks like, if I adjust this bandwidth control and I boost it here, you can see that at this cutoff point there is a little bump. So that's boosting the frequency, and when I move the cutoff that bump moves with it. So that's exactly what the resonance control in the filter is doing. So I will make this pretty extreme, so we can definitely hear it. (music playing) So that's what's going on in ESM. It's just another way to visualize it.
So I will disengage that and move this out of the way. So once we have the filter set the way that we like then we can explore the amplifier stage.
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