Respond to CR.

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -2693,8 +2693,7 @@ typedef enum : NSUInteger {
 
     if ([Environment.preferences soundInForeground]) {
         SystemSoundID soundId = [OWSSounds systemSoundIDForSound:OWSSound_MessageSent quiet:YES];
-        // Vibrate, respect silent switch, respect "Alert" volume, not media volume.
-        AudioServicesPlayAlertSound(soundId);
+        AudioServicesPlaySystemSound(soundId);
     }
 }
 

SignalMessaging/environment/OWSSounds.m

@@ -96,7 +96,7 @@ NSString *const kOWSSoundsStorageGlobalNotificationKey = @"kOWSSoundsStorageGlob
     _dbConnection = primaryStorage.newDatabaseConnection;
 
     // Don't store too many sounds in memory. Most users will only use 1 or 2 sounds anyway.
-    _cachedSystemSounds = [[AnyLRUCache alloc] initWithMaxSize:3];
+    _cachedSystemSounds = [[AnyLRUCache alloc] initWithMaxSize:4];
 
     OWSSingletonAssert();