diff --git a/MA2ME/AppDelegate.m b/MA2ME/AppDelegate.m
index 378f6d3..d632eb2 100644
--- a/MA2ME/AppDelegate.m
+++ b/MA2ME/AppDelegate.m
@@ -91,7 +91,8 @@ static NSString *kMyContext = @"kMyContext";
     [self addObserver: self forKeyPath: @"mameNoThrottle" options:0  context: (__bridge void * _Nullable)(kMyContext)];
     
     [_slotController addObserver: self forKeyPath: @"args" options: 0 context:  (__bridge void * _Nullable)(kMyContext)];
-    
+    [_mediaController addObserver: self forKeyPath: @"args" options: 0 context:  (__bridge void * _Nullable)(kMyContext)];
+
     [_mediaController bind: @"media" toObject: _slotController withKeyPath: @"media" options: 0];
     
     [self buildCommandLine];
@@ -225,11 +226,17 @@ static NSString * JoinArguments(NSArray *argv) {
     }
 
     
-    NSArray *args = [_slotController args];
+    NSArray *args;
+    args = [_slotController args];
     if ([args count]) {
         [argv addObjectsFromArray: args];
     }
     
+    args = [_mediaController args];
+    if ([args count]) {
+        [argv addObjectsFromArray: args];
+    }
+
     if (_mameNoThrottle) [argv addObject: @"-nothrottle"];
     
     
diff --git a/MA2ME/MA2ME/Base.lproj/MediaView.xib b/MA2ME/MA2ME/Base.lproj/MediaView.xib
index 59d3a0a..96c43aa 100644
--- a/MA2ME/MA2ME/Base.lproj/MediaView.xib
+++ b/MA2ME/MA2ME/Base.lproj/MediaView.xib
@@ -63,10 +63,10 @@
                                         <rect key="frame" x="1" y="21" width="304" height="17"/>
                                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                                         <subviews>
-                                            <textField identifier="CategoryView" verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Pep-mX-LHY">
+                                            <textField verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Pep-mX-LHY">
                                                 <rect key="frame" x="0.0" y="0.0" width="304" height="17"/>
                                                 <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES"/>
-                                                <textFieldCell key="cell" lineBreakMode="truncatingTail" sendsActionOnEndEditing="YES" identifier="CategoryView" title="Table View Cell" id="Rrg-wr-8eL">
+                                                <textFieldCell key="cell" lineBreakMode="truncatingTail" sendsActionOnEndEditing="YES" title="Table View Cell" id="Rrg-wr-8eL">
                                                     <font key="font" metaFont="system"/>
                                                     <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                                     <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
@@ -87,6 +87,9 @@
                                                 <pathCell key="cell" controlSize="small" selectable="YES" editable="YES" focusRingType="none" alignment="left" pathStyle="popUp" id="dcz-8y-tKb">
                                                     <font key="font" metaFont="smallSystem"/>
                                                 </pathCell>
+                                                <connections>
+                                                    <action selector="pathAction:" target="-2" id="4oX-bW-ANp"/>
+                                                </connections>
                                             </pathControl>
                                             <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="zNo-ij-mUl">
                                                 <rect key="frame" x="256" y="5" width="23" height="18"/>
@@ -96,7 +99,7 @@
                                                     <font key="font" metaFont="smallSystem"/>
                                                 </buttonCell>
                                                 <connections>
-                                                    <action selector="buttonDelete:" target="-2" id="f30-YS-1UK"/>
+                                                    <action selector="deleteAction:" target="-2" id="XAl-eQ-nUj"/>
                                                 </connections>
                                             </button>
                                         </subviews>
diff --git a/MA2ME/MediaViewController.h b/MA2ME/MediaViewController.h
index f13f462..456fd8d 100644
--- a/MA2ME/MediaViewController.h
+++ b/MA2ME/MediaViewController.h
@@ -14,7 +14,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (weak) IBOutlet NSOutlineView *outlineView;
 @property (nonatomic) NSDictionary *media;
-- (IBAction)buttonDelete:(id)sender;
+@property NSArray *args;
+
+- (IBAction)deleteAction:(id)sender;
+- (IBAction)pathAction:(id)sender;
 
 
 //-(void)setMedia: (NSDictionary *)media;
diff --git a/MA2ME/MediaViewController.m b/MA2ME/MediaViewController.m
index e71d54d..568a8df 100644
--- a/MA2ME/MediaViewController.m
+++ b/MA2ME/MediaViewController.m
@@ -233,6 +233,36 @@ enum {
     kIndexCassette
 };
 
+-(void)rebuildArgs {
+    
+    static char* prefix[] = {
+        "flop", "flop", "hard", "cdrm", "cass"
+    };
+    NSMutableArray *args = [NSMutableArray new];
+    
+    unsigned counts[5] = { 0, 0, 0, 0, 0 };
+    
+    for (unsigned j = 0; j < 5; ++j) {
+    
+        MediaCategory *cat = _data[j];
+        NSInteger valid = [cat validCount];
+        for (NSInteger i = 0; i < valid; ++i) {
+            counts[j]++;
+
+            MediaItem *item = [cat objectAtIndex: i];
+            NSURL *url = [item url];
+            if (!url) continue;
+            [args addObject: [NSString stringWithFormat: @"-%s%u", prefix[j], counts[j]]];
+            NSString *s = [NSString stringWithCString: [url fileSystemRepresentation] encoding: NSUTF8StringEncoding];
+            
+            [args addObject: s];
+        }
+        if (j == 0) counts[1] = counts[0]; // 3.5/5.25
+    }
+    
+    [self setArgs: args];
+}
+
 -(void)rebuildRoot {
     NSMutableArray *tmp = [NSMutableArray new];
     for (unsigned j = 0 ; j < 5; ++j) {
@@ -274,7 +304,10 @@ enum {
     }
 
     
-    if (delta) [self rebuildRoot];
+    if (delta) {
+        [self rebuildRoot];
+        [self rebuildArgs];
+    }
 }
 
 - (void)viewDidLoad {
@@ -371,7 +404,7 @@ enum {
 
 
 #pragma mark - IBActions
-- (IBAction)buttonDelete:(id)sender {
+- (IBAction)deleteAction:(id)sender {
     
     NSInteger row = [_outlineView rowForView: sender];
     if (row < 0) return;
@@ -386,5 +419,10 @@ enum {
         MediaCategory *cat = [_outlineView parentForItem: item];
         if ([cat pruneChildren]) [self rebuildRoot];
     }
+    [self rebuildArgs];
+}
+
+- (IBAction)pathAction:(id)sender {
+    [self rebuildArgs];
 }
 @end