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Following on from the article about using gates on drums. I want to describe the main reason I use gates and that's to lock the bass into another pattern such as the kick drum.

It's quite a common use for a gate and when set well, it's subtle and almost unnoticeable, but definitely noticeable when you turn the effect off. It's simple to set up although it does involve a few steps.

The Set-up

Let's say we start with two tracks:

1. Channel 1 is the drums. Most likely a stereo set from a loop/drum plug-in or a submix from acoustic drums
2. Channel 2 is the bass guitar. Most likely mono (although a blended mix of mics/DI etc could also be used

The channel order's completely up to you. The only reason I've mentioned track numbers here is so that it's easier to refer to them as I type.

The 1st Gate

We'll put a send on Channel 1 (drums). In Logic, let's say that we send the signal to Bus 1. I usually set it 0dB (that's n oreduction or gain on the send in Logic) most of the time and pre-fader unless I need to process the drums a lot.

Now we go to the send channel (Bus 1). If you've got the drums playing, you should see the meters for the Bus channel moving in sync with the drums. We only want the bass to be in sync with the kick drum, not the whole drum kit.

We now insert the gate on the send channel Bus 1. Set the gate so that it only triggers on the kick drum. If there's a monitor function so you can hear what the gate responds to, then use that. When you've got the setting, stop the send going to the main output or mixbuss. We don't need the sound as an output into the main mix. You should see Bus 1 channel's meters respond to the kick drum only now.

The 2nd Gate

Now go to the bass channel (Channel 1) and insert a noise gate there. You want it to trigger when there's a bass signal so set the threshold accordingly. I usually have the signal reduction set to only -2dB or -3dB. The reason for that such a small dB reduction is that the gate will always let the bass signal through, but will also let the extra 2dB through when the kick drum triggers it. To do that we put Bus 1 as the gate's sidechain.

The Result

Listen to it now and the bass should be accentuated with the kick, giving the impression of being locked-in more that it was previously.

Quick settings in Logic

Setup the gates as above and select the Isolate Kick preset in the gate. Listen to the signal with the monitor function. Actually you can do without this and use the meters instead if you can hear the kick well enough. Change the eq filter and threshold so that only the kickdrum comes through - usually this means reducing the High Cut almost to its lowest level so that it doesn't pick up the snare and bringing down the threshold until the kick triggers the gate. Turn off the monitor in the gate and change the output of the aux channel so that it has no output.

For the gate on the bass, select the Isolate Bass preset. Change the sidechain input to Bus 1. Set the threshold so that the bass always comes through and set the reduction to -2dB.

Why 2 gates?

I find it to be a lot more accurate. It's possible to route the Channel 1 (drums) to the sidechain input of the gate on Channel 2 (bass). You can then change the eq setting so that only the kick drum comes through. But I've always found that there's a little bit of leakage from other instruments doing it this way and rather than just have eq filtering out the drums, I like having the 1st noise gate isolating thekick. At least that way, I can decide whether I'd prefer to miss a few hits of the kick or have it respond to a few hits from the snare as well, depending on how tight the threshold and eq values are.

Other ideas

Vary the reduction amount to get a more dramatic accent until it quickly starts to have a detrimental effect rather than being a positive creative tool. But as always, try it, it may prove useful to you.

You could also switch the gate for a compressor (and again use the Bus 1 as the sidechain input) for the opposite effect. It might sound like it wouldn't work since it would decrease the bond between the kick and bass. I find it useful when the kick has a tone of its own that I'd like to come through. In that case, the bass and the kick together may be too much so using the compressor allows the kick to shine through.

I think you can do something similar by using a positive value in the reduction. This is where the terminology gets confusing: to increase the non-triggered volume, have a positive number for the reduction (i.e. it's not a reduction anymore). To think around this, interpret the reduction value as what the gate does to the non-triggered signal.

Part of a series by Award Sounds offering a selection of creative ideas to kick-start or rejuvenate a composition.  

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