diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/Messages/SessionInfo ParseMessage.swift b/Sources/DAWFileKit/ProTools/SessionInfo/Messages/SessionInfo ParseMessage.swift
index 27b37e00..8c054315 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/Messages/SessionInfo ParseMessage.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/Messages/SessionInfo ParseMessage.swift	
@@ -7,7 +7,7 @@
 import Foundation
 
 extension ProTools.SessionInfo {
-    public enum ParseMessage: Error {
+    public enum ParseMessage {
         /// Info message.
         /// Can be disregarded and only useful for debugging.
         case info(String)
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Clip.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Clip.swift
index d9125ad7..c75cce8b 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Clip.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Clip.swift	
@@ -17,3 +17,5 @@ extension ProTools.SessionInfo {
         public internal(set) var online: Bool = true
     }
 }
+
+extension ProTools.SessionInfo.Clip: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo File.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo File.swift
index edf69376..15ff5610 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo File.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo File.swift	
@@ -16,3 +16,5 @@ extension ProTools.SessionInfo {
         public internal(set) var online: Bool = true
     }
 }
+
+extension ProTools.SessionInfo.File: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Main.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Main.swift
index 2b4384a5..590c693c 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Main.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Main.swift	
@@ -24,3 +24,5 @@ extension ProTools.SessionInfo {
         public internal(set) var audioFileCount: Int?
     }
 }
+
+extension ProTools.SessionInfo.Main: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Marker.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Marker.swift
index 66878ba9..f3cc0cf0 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Marker.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Marker.swift	
@@ -106,6 +106,8 @@ extension ProTools.SessionInfo {
     }
 }
 
+extension ProTools.SessionInfo.Marker: Sendable { }
+
 extension ProTools.SessionInfo.Marker {
     /// Marker track type.
     public enum TrackType: String, Equatable, Hashable {
@@ -129,3 +131,5 @@ extension ProTools.SessionInfo.Marker {
         case track = "Track"
     }
 }
+
+extension ProTools.SessionInfo.Marker.TrackType: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo OrphanData.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo OrphanData.swift
index 638ddbeb..82ea3742 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo OrphanData.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo OrphanData.swift	
@@ -12,3 +12,5 @@ extension ProTools.SessionInfo {
         public internal(set) var content: [String]
     }
 }
+
+extension ProTools.SessionInfo.OrphanData: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Plugin.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Plugin.swift
index d535297c..9e94b5d1 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Plugin.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Plugin.swift	
@@ -17,3 +17,5 @@ extension ProTools.SessionInfo {
         public internal(set) var numberOfInstances: String = ""
     }
 }
+
+extension ProTools.SessionInfo.Plugin: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Track.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Track.swift
index fe83f863..e5cd8691 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Track.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Track.swift	
@@ -19,6 +19,10 @@ extension ProTools.SessionInfo {
     }
 }
 
+extension ProTools.SessionInfo.Track: Sendable { }
+
+// MARK: - State
+
 extension ProTools.SessionInfo.Track {
     /// A track's state.
     public enum State: String {
@@ -30,6 +34,10 @@ extension ProTools.SessionInfo.Track {
     }
 }
 
+extension ProTools.SessionInfo.Track.State: Sendable { }
+
+// MARK: - Clip
+
 extension ProTools.SessionInfo.Track {
     /// Represents a clip contained on a track.
     public struct Clip: Equatable, Hashable {
@@ -40,12 +48,20 @@ extension ProTools.SessionInfo.Track {
         public internal(set) var endTime: ProTools.SessionInfo.TimeValue?
         public internal(set) var duration: ProTools.SessionInfo.TimeValue?
         public internal(set) var state: State = .unmuted
-        
-        /// A clip's state (such as 'Muted', 'Unmuted')
-        public enum State: String {
-            // ***** there may be more states possible than this -- need to test
-            case muted   = "Muted"
-            case unmuted = "Unmuted"
-        }
     }
 }
+
+extension ProTools.SessionInfo.Track.Clip: Sendable { }
+
+// MARK: - Clip State
+
+extension ProTools.SessionInfo.Track.Clip {
+    /// A clip's state (such as 'Muted', 'Unmuted')
+    public enum State: String {
+        // TODO: there may be more states possible than this -- need to test
+        case muted   = "Muted"
+        case unmuted = "Unmuted"
+    }
+}
+
+extension ProTools.SessionInfo.Track.Clip.State: Sendable { }
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Versions.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Versions.swift
index 1811c992..56baf30e 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Versions.swift	
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo Versions.swift	
@@ -16,6 +16,8 @@ extension ProTools.SessionInfo {
     }
 }
 
+extension ProTools.SessionInfo.MarkersListingVersion: Sendable { }
+
 extension ProTools.SessionInfo.MarkersListingVersion {
     public var columnCount: Int {
         switch self {
diff --git a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo.swift b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo.swift
index 993decc4..f503f6ad 100644
--- a/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo.swift
+++ b/Sources/DAWFileKit/ProTools/SessionInfo/SessionInfo.swift
@@ -41,6 +41,8 @@ extension ProTools {
     }
 }
 
+extension ProTools.SessionInfo: Sendable { }
+
 // MARK: - Constants
 
 extension ProTools.SessionInfo {