diff --git a/Sources/AudioKitEX/AudioKitAU.swift b/Sources/AudioKitEX/AudioKitAU.swift
index d20fcf9..eec6eca 100644
--- a/Sources/AudioKitEX/AudioKitAU.swift
+++ b/Sources/AudioKitEX/AudioKitAU.swift
@@ -45,7 +45,9 @@ open class AudioKitAU: AUAudioUnit {
     
     /// Delllocate Render Resources
     override public func deallocateRenderResources() {
+        let allocated = renderResourcesAllocated
         super.deallocateRenderResources()
+        guard allocated else { return }
         deallocateRenderResourcesDSP(dsp)
         internalBuffers = []
     }
diff --git a/Tests/AudioKitEXTests/DryWetMixerTests.swift b/Tests/AudioKitEXTests/DryWetMixerTests.swift
index d4651e1..ba31b1a 100644
--- a/Tests/AudioKitEXTests/DryWetMixerTests.swift
+++ b/Tests/AudioKitEXTests/DryWetMixerTests.swift
@@ -9,6 +9,11 @@ class DryWetMixerTests: XCTestCase {
     let input1 = PlaygroundOscillator(waveform: Table(.triangle))
     let input2 = PlaygroundOscillator(waveform: Table(.triangle), frequency: 1280)
 
+    override func setUp() {
+        super.setUp()
+        Settings.sampleRate = 44100
+    }
+
     func testDefault() {
         let engine = AudioEngine()
         let mixer = DryWetMixer(dry: input1, wet: input2)
diff --git a/Tests/AudioKitEXTests/FaderTests.swift b/Tests/AudioKitEXTests/FaderTests.swift
index c39c2d3..d9a5e75 100644
--- a/Tests/AudioKitEXTests/FaderTests.swift
+++ b/Tests/AudioKitEXTests/FaderTests.swift
@@ -6,6 +6,11 @@ import XCTest
 
 class FaderTests: XCTestCase {
 
+    override func setUp() {
+        super.setUp()
+        Settings.sampleRate = 44100
+    }
+
     func testDefault() {
         let engine = AudioEngine()
         let url = Bundle.module.url(forResource: "12345", withExtension: "wav", subdirectory: "TestResources")!