Added missing documentation to the source code in the Playdate bindings target.

Sources/PlaydateKit/Sound/Signal/Classes/ControlSignal.swift

@@ -21,6 +21,7 @@ extension Sound {
             }
         }
 
+        /// Removes all events from the signal's timeline.
         public func clearEvents() {
             ControlSignal.api.pointee.clearEvents.unsafelyUnwrapped(pointer)
         }
@@ -32,6 +33,7 @@ extension Sound {
                                                          interpolate ? 1 : 0)
         }
 
+        /// Removes the event at `step`, if any.
         public func removeEvent(step: Int) {
             ControlSignal.api.pointee.removeEvent.unsafelyUnwrapped(pointer, Int32(step))
         }

Sources/PlaydateKit/Sound/Signal/Classes/Envelope.swift

@@ -22,18 +22,22 @@ extension Sound {
             }
         }
 
+        /// The attack time, in seconds.
         public func setAttack(_ attack: Float) {
             Envelope.api.pointee.setAttack.unsafelyUnwrapped(pointer, attack)
         }
 
+        /// The decay time, in seconds.
         public func setDecay(_ decay: Float) {
             Envelope.api.pointee.setDecay.unsafelyUnwrapped(pointer, decay)
         }
 
+        /// The sustain level, 0...1.
         public func setSustain(_ sustain: Float) {
             Envelope.api.pointee.setSustain.unsafelyUnwrapped(pointer, sustain)
         }
 
+        /// The release time, in seconds.
         public func setRelease(_ release: Float) {
             Envelope.api.pointee.setRelease.unsafelyUnwrapped(pointer, release)
         }
@@ -66,6 +70,7 @@ extension Sound {
             Envelope.api.pointee.setRateScaling.unsafelyUnwrapped(pointer, scaling, start, end)
         }
 
+        /// The envelope's current value.
         public var value: Float {
             Envelope.api.pointee.getValue.unsafelyUnwrapped(pointer)
         }

Sources/PlaydateKit/Sound/Signal/Classes/LFO.swift

@@ -89,6 +89,7 @@ extension Sound {
             LFO.api.pointee.setRandomSeed.unsafelyUnwrapped(pointer, seed)
         }
 
+        /// The LFO's current value.
         public var value: Float {
             LFO.api.pointee.getValue.unsafelyUnwrapped(pointer)
         }