diff --git a/pc/shared/kbd.cpp b/pc/shared/kbd.cpp
new file mode 100644
index 00000000..4bf7ea6c
--- /dev/null
+++ b/pc/shared/kbd.cpp
@@ -0,0 +1,46 @@
+#include "kbd.h"
+
+bool MODONLY(const Uint16 &mod, const Uint16 k)
+{
+  enum {
+    CTRL=0,
+    SHIFT,
+    ALT,
+    GUI,
+    MOD_END
+  };
+  // iteration of each left/right modifier key group
+  Uint16 modLR[4] = {
+    KMOD_CTRL,
+    KMOD_SHIFT,
+    KMOD_ALT,
+    KMOD_GUI
+  };
+
+  bool match = true;
+
+  // for each modifier key group L/R pair
+  for (int i=0; i < MOD_END; i++)
+  {
+    if (k & modLR[i]) // if we're supposed to be checking for ANY of these pair
+    {
+      // if the keys pressed do not reflect the keys checked for
+      // (applies to any specified L / R / LR mod key combo)
+      if ( ! ( (mod & modLR[i]) & (k & modLR[i]) ) )
+      {
+        match = false;
+        break;
+      }
+    }
+    else // if we're not supposed to be checking for this pair
+    {
+      if (mod & modLR[i]) // make sure this pair's keys are not held
+      {
+        match = false;
+        break;
+      }
+    }
+  }
+
+  return match;
+}
diff --git a/pc/shared/kbd.h b/pc/shared/kbd.h
index 17a81db4..f081bef2 100644
--- a/pc/shared/kbd.h
+++ b/pc/shared/kbd.h
@@ -5,11 +5,11 @@
  * held, and to check if any modifier is held, respectively:
  *
  * Examples:
- * check if only the CTRL modifier (left or right) is held:
- *   if (MODONLY(mod, KMOD_CTRL))
+ * check for CTRL + SHIFT:
+ *   if (MODONLY(mod, KMOD_CTRL | KMOD_SHIFT))
  *
  *
  *
  *   */
-#define MODONLY(mod, k) ( (mod) & (k) && !( (mod) & ~(k) ) )
+bool MODONLY(const Uint16 &mod, const Uint16 k);
 #define MOD_ANY(mod) (mod & (KMOD_CTRL | KMOD_SHIFT | KMOD_ALT | KMOD_GUI))
diff --git a/pc/tracker/Instruments.cpp b/pc/tracker/Instruments.cpp
index d3f122f5..331032b9 100644
--- a/pc/tracker/Instruments.cpp
+++ b/pc/tracker/Instruments.cpp
@@ -1,3 +1,5 @@
+#include "platform.h"
+#include "kbd.h"
 #include "tracker/Instruments.h"
 #include "shared/Colors.h"
 #include "shared/sdl_userevents.h"
@@ -620,13 +622,13 @@ int Instrument_Panel::event_handler(const SDL_Event &ev)
         switch(scancode)
         {
           case SDLK_UP:
-            if (mod & KMOD_SHIFT && !(mod & KMOD_CTRL))
+            if (MODONLY(mod, KMOD_SHIFT))
             {
               dec_currow();
             }
             break;
           case SDLK_DOWN:
-            if (mod & KMOD_SHIFT && !(mod & KMOD_CTRL))
+            if (MODONLY(mod, KMOD_SHIFT))
             {
               inc_currow();
             }
diff --git a/pc/tracker/Pattern.cpp b/pc/tracker/Pattern.cpp
index 24c2d8da..819c5be9 100644
--- a/pc/tracker/Pattern.cpp
+++ b/pc/tracker/Pattern.cpp
@@ -750,31 +750,31 @@ int PatSeqPanel::event_handler(const SDL_Event &ev)
         switch(scancode)
         {
           case SDLK_UP:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
             {
               dec_currow();
             }
             break;
           case SDLK_DOWN:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
             {
               inc_currow();
             }
             break;
           case SDLK_LEFT:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
               decpat(this);
           break;
           case SDLK_RIGHT:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
               incpat(this);
           break;
           case SDLK_F9:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
               clear(this);
           break;
           case SDLK_F10:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
             {
               //insert_pattern();
               PatternMeta *p = get_current_pattern_meta(this);
@@ -795,11 +795,11 @@ int PatSeqPanel::event_handler(const SDL_Event &ev)
             }
           break;
           case SDLK_F11:
-            if (MODONLY(mod, KMOD_CTRL))
+            if (MODONLY(mod, CMD_CTRL_KEY))
               clone_seq_common(this);
           break;
           case SDLK_F12:
-          if (MODONLY(mod, KMOD_CTRL))
+          if (MODONLY(mod, CMD_CTRL_KEY))
             clone(this);
           break;
 
@@ -1865,7 +1865,7 @@ void PatternEditorPanel::events_kb_universal(const int scancode, const int mod)
   switch(scancode)
   {
     case SDLK_w:
-      if (MODONLY(mod, KMOD_CTRL))
+      if (MODONLY(mod, CMD_CTRL_KEY))
         pattern_wrap = !pattern_wrap;
     break;
     case SDLK_PAGEUP:
@@ -1954,9 +1954,6 @@ void PatternEditorPanel::events_kb_universal(const int scancode, const int mod)
   }
 }
 
-#define MODONLY(mod, k) ( (mod) & (k) && !( (mod) & ~(k) ) )
-#define MOD_ANY(mod) (mod & (KMOD_CTRL | KMOD_SHIFT | KMOD_ALT | KMOD_GUI))
-
 void PatternEditorPanel::piano_kb(const int scancode, const int mod)
 {
 	if (MOD_ANY(mod))
diff --git a/pc/tracker/Samples.cpp b/pc/tracker/Samples.cpp
index d0ece880..718f20c5 100644
--- a/pc/tracker/Samples.cpp
+++ b/pc/tracker/Samples.cpp
@@ -1,3 +1,6 @@
+#include "platform.h"
+#include "kbd.h"
+
 #include "Samples.h"
 #include "Instruments.h"
 #include "shared/Colors.h"
@@ -9,6 +12,8 @@
 #include "globals.h" // for ::mouse
 #include "PanelCommon.h"
 
+
+
 const int Sample_Panel::NUM_ROWS;
 #define SAMPLE_NAME_GUI_CHAR_WIDTH 22
 
@@ -568,14 +573,14 @@ int Sample_Panel::event_handler(const SDL_Event &ev)
         switch(scancode)
         {
           case SDLK_UP:
-            if (mod & KMOD_SHIFT && (mod & KMOD_CTRL))
+            if (MODONLY(mod, KMOD_SHIFT | CMD_CTRL_KEY))
             {
               dec_currow();
 							return ROW_UPDATED;
             }
             break;
           case SDLK_DOWN:
-            if (mod & KMOD_SHIFT && (mod & KMOD_CTRL))
+            if (MODONLY(mod, KMOD_SHIFT | CMD_CTRL_KEY))
             {
               inc_currow();
 							return ROW_UPDATED;
diff --git a/pc/tracker/Tracker.cpp b/pc/tracker/Tracker.cpp
index a403a883..119f6a91 100644
--- a/pc/tracker/Tracker.cpp
+++ b/pc/tracker/Tracker.cpp
@@ -439,11 +439,11 @@ void Tracker::handle_events()
         switch (scancode)
         {
           case SDLK_LEFT:
-            if ((mod & KMOD_SHIFT) && (mod & KMOD_CTRL))
+            if ( MODONLY(mod, KMOD_SHIFT | CMD_CTRL_KEY) )
               mousecursors->prev();
           break;
           case SDLK_RIGHT:
-            if ((mod & KMOD_SHIFT) && (mod & KMOD_CTRL))
+            if ( MODONLY(mod, KMOD_SHIFT | CMD_CTRL_KEY) )
               mousecursors->next();
           break;
 					case SDLK_RETURN: