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Let's explore the signal flow in ES 1. It's like we have seen before with some of the other Logic synths; there are three main components to any subtractive synthesizer: there is an oscillator section, a filter section, and an amplifier. So in ES 1, if you are looking at the top half here, we have got the oscillator section on the left. And one thing that's neat about this is we've got a primary oscillator and then beneath that a sub-oscillator, and we can blend between the two. In the center, we've got a lowpass filter with variable slope and a drive input to saturate the input of the filter.
On the right, we've got the amplifier section where we can control the output of ES 1. Beneath that, we have the Modulation section. So, most of the parameters down here are going to control some aspect of the three main components above. We have this router section, and that's where we can choose the destination for any of the modulation that's happening. So, one of the modulators is this LFO, low-frequency oscillator. It's very much like the oscillators that are above that generate waveforms, but the difference is the low-frequency oscillator is generating a control signal. So it's not something that we actually hear; it's just sending a periodic waveform that's going to modulate some parameter.
We choose that parameter in the router that's in the center. Here we have got the Mod envelope, and that's also a modulation source. It's kind of a simplified envelope, much like we've seen with this ADSR or in some of the other instruments we've seen, more simplified attack and release envelopes. So this is a variation on that that can also be assigned to modulate a number of destinations that you can choose in the router. The ADSR envelope is wired into the amplifier, so it's going to shape the volume of the sound. We can also use it to modulate the filter cutoff as well.
Over on the far left, we've also got the glide control. This will allow us to transition smoothly between nodes. We can adjust the amount of time it takes. Beneath this section we've got the global section, so here we can do the fine-tuning adjustments to the entire instrument. It has an Analog parameter here. What this is going to do is it's going to create some randomness in the sound. So it'll randomly offset the tuning and the filter cutoff, just to give it a more analog and lifelike sound. We have got the pitch-bend range here, where both positive and negative can go up to twenty-four semitones, which is two octaves.
Then we've got the Output Level. Next to that we've got the Voice controls. ES 1 is a polyphonic synthesizer, so we can have it be all the way up to sixteen voices, we can set it down to one voice so that it's monophonic, and it has another mode that we haven't seen before. If I take this past 16, it's the Legato mode, and what that's going to do is allow us to play notes that are next to each other, so it'll be monophonic, but it'll play notes, but it won't retrigger the envelope. So we'll explore that a little later. ES 1 also has a built-in chorus effect. Taking a look here, it actually has three: there is the Chorus1 that we saw in ES E that's just a basic modulated course sound; the Chorus2, which is a heavier modulation; and the Ensemble, which has more complex modulation routing for the chorus.
One of the hidden parts of the interface, if you click on this disclosure triangle at the bottom, is you can adjust the negative pitch-bend range independently of the positive one. So right now, it's set to the same as the positive pitch-bend range, but if I want to set it to something different, I can move the slider here and adjust it in semitones. And if I want to set it back to its default, I can hold down Option and click and it's going to set it back. So let's take a look at the oscillator section.
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