Fixed a test and pinned the AK dependency to 5.6

Author: aure

Package.swift

@@ -9,7 +9,7 @@ let package = Package(
     products: [.library(name: "SoundpipeAudioKit", targets: ["SoundpipeAudioKit"])],
     dependencies: [
         .package(url: "https://github.com/AudioKit/KissFFT", from: "1.0.0"),
-        .package(url: "https://github.com/AudioKit/AudioKit", branch: "main"),
+        .package(url: "https://github.com/AudioKit/AudioKit", from: "5.6.0"),
         .package(url: "https://github.com/AudioKit/AudioKitEX", from: "5.5.0"),
     ],
     targets: [

Tests/SoundpipeAudioKitTests/PitchTapTests.swift

@@ -14,7 +14,8 @@ class PitchTapTests: XCTestCase {
         oscillator.$frequency.ramp(to: 660, duration: 1.0)
 
         var pitches: [Float] = []
-        let knownValues: [Float] = [100.0, 448.91534, 457.72495, 476.3929, 503.23022, 519.6525, 533.7021, 562.2199, 576.985, 598.7911]
+        let knownValues: [Float] = [100.0, 448.91534, 459.8243, 472.9798, 495.56476, 521.5465, 541.39246, 566.3455, 600.9849, 610.31995]
+
 
         let expect = expectation(description: "wait for amplitudes")