diff --git a/Sources/AudioKitUI/Controls/ADSRWidget.swift b/Sources/AudioKitUI/Controls/ADSRWidget.swift
index 644415e..b62e22c 100644
--- a/Sources/AudioKitUI/Controls/ADSRWidget.swift
+++ b/Sources/AudioKitUI/Controls/ADSRWidget.swift
@@ -7,6 +7,10 @@ public struct ADSRWidget: UIViewRepresentable {
     public typealias UIViewType = ADSRView
     var callback: (AUValue, AUValue, AUValue, AUValue) -> Void
 
+    public init(callback: @escaping (AUValue, AUValue, AUValue, AUValue) -> Void) {
+        self.callback = callback
+    }
+
     public func makeUIView(context _: Context) -> ADSRView {
         let view = ADSRView(callback: callback)
         view.bgColor = .systemBackground