Playgrounds

Balancing Nodes

Sometimes you want to ensure that an audio signal that you're processing remains at a volume similar to where it started. Such an application is perfect for the AKBalancer node.

import AudioKitPlaygrounds
import AudioKit

This section prepares the players

let file = try AKAudioFile(readFileName: "drumloop.wav", baseDir: .resources)
var source = try AKAudioPlayer(file: file)
source.looping = true

let highPassFiltering = AKHighPassFilter(source, cutoffFrequency: 900)
let lowPassFiltering = AKLowPassFilter(highPassFiltering, cutoffFrequency: 300)

At this point you don't have much signal left, so you balance it against the original signal!

let rebalancedWithSource = AKBalancer(lowPassFiltering, comparator: source)

AudioKit.output = rebalancedWithSource
AudioKit.start()
source.play()

User Interface Set up

class PlaygroundView: AKPlaygroundView {

    override func setup() {
        addTitle("Balancing Nodes")

        addLabel("Listen to the difference in volume:")
        addSubview(AKBypassButton(node: rebalancedWithSource))
    }

}

import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.liveView = PlaygroundView()