diff --git a/examples/UsingProgmem/UsingProgmem.ino b/examples/UsingProgmem/UsingProgmem.ino
index 3aa0b17..908d584 100644
--- a/examples/UsingProgmem/UsingProgmem.ino
+++ b/examples/UsingProgmem/UsingProgmem.ino
@@ -24,11 +24,14 @@
 
     The pattern below will only work with 1 TLC.  Copy + Paste the 4 lines
     inside the curly brackets for each additional TLC. */
+
+const unsigned int TlcMax = 4095;
+
 const uint8_t gsArray1[NUM_TLCS * 24] PROGMEM = {               
-  GS_DUO((4095 * 16)/16, (4095 * 15)/16), GS_DUO((4095 * 14)/16, (4095 * 13)/16),
-  GS_DUO((4095 * 12)/16, (4095 * 11)/16), GS_DUO((4095 * 10)/16, (4095 * 9)/16),
-  GS_DUO((4095 * 8)/16, (4095 * 7)/16), GS_DUO((4095 * 6)/16, (4095 * 5)/16),
-  GS_DUO((4095 * 4)/16, (4095 * 3)/16), GS_DUO((4095 * 2)/16, (4095 * 1)/16),
+  GS_DUO((TlcMax * 16)/16, (TlcMax * 15)/16), GS_DUO((TlcMax * 14)/16, (TlcMax * 13)/16),
+  GS_DUO((TlcMax * 12)/16, (TlcMax * 11)/16), GS_DUO((TlcMax * 10)/16, (TlcMax * 9)/16),
+  GS_DUO((TlcMax * 8)/16, (TlcMax * 7)/16), GS_DUO((TlcMax * 6)/16, (TlcMax * 5)/16),
+  GS_DUO((TlcMax * 4)/16, (TlcMax * 3)/16), GS_DUO((TlcMax * 2)/16, (TlcMax * 1)/16),
 };
 
 void setup()
diff --git a/tlc_config.h b/tlc_config.h
index 9a81d1e..a7382c6 100644
--- a/tlc_config.h
+++ b/tlc_config.h
@@ -158,7 +158,9 @@
 /** Arranges 2 grayscale values (0 - 4095) in the packed array format (3 bytes).
     This is for array initializers only: the output is three comma seperated
     8-bit values. */
-#define GS_DUO(a, b)    ((a) >> 4), ((a) << 4) | ((b) >> 8), (b)
+//#define GS_DUO(a, b)  ((a) >> 4), ((a) << 4) | ((b) >> 8), (b)
+#define GS_DUO(a, b)    (uint8_t)((a) >> 4), (uint8_t)((a) << 4) | (uint8_t)((b) >> 8), (uint8_t)(b)
+
 
 
 #if VPRG_ENABLED
diff --git a/tlc_progmem_utils.h b/tlc_progmem_utils.h
index e1f7c97..a87ae28 100644
--- a/tlc_progmem_utils.h
+++ b/tlc_progmem_utils.h
@@ -26,9 +26,9 @@
 #include "Tlc5940.h"
 #include "pinouts/pin_functions.h"
 
-void tlc_setGSfromProgmem(const uint8_t PROGMEM *gsArray);
+void tlc_setGSfromProgmem(const uint8_t /*PROGMEM*/ *gsArray);
 #if VPRG_ENABLED
-void tlc_setDCfromProgmem(const uint8_t PROGMEM *dcArray);
+void tlc_setDCfromProgmem(const uint8_t /*PROGMEM*/ *dcArray);
 #endif
 
 /** \addtogroup ExtendedFunctions
@@ -62,9 +62,9 @@ Tlc.update();
     The format of the grayscale array is explained in #tlc_GSData.
 
     \param gsArray A progmem array of grayscale data. */
-void tlc_setGSfromProgmem(const uint8_t PROGMEM *gsArray)
+void tlc_setGSfromProgmem(const uint8_t /*PROGMEM*/ *gsArray)
 {
-    const uint8_t PROGMEM *gsArrayp = gsArray;
+    const uint8_t /*PROGMEM*/ *gsArrayp = gsArray;
     uint8_t *gsDatap = tlc_GSData;
     while (gsDatap < tlc_GSData + NUM_TLCS * 24) {
         *gsDatap++ = pgm_read_byte(gsArrayp++);