diff --git a/firmware/main.c b/firmware/main.c
index 9e36e2e..971e755 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -72,9 +72,12 @@ PGM_P const help_table[] PROGMEM = {
 	help_16
 };
 
-volatile uint8_t* PORTS[CHANNELS_1+CHANNELS_2] = {&PORTC,&PORTC,&PORTC,&PORTC,&PORTC,&PORTD,&PORTD,&PORTD,&PORTD,&PORTD};
-volatile uint8_t* DDRS[CHANNELS_1+CHANNELS_2] = {&DDRC,&DDRC,&DDRC,&DDRC,&DDRC,&DDRD,&DDRD,&DDRD,&DDRD,&DDRD};
-const uint8_t BITS[CHANNELS_1+CHANNELS_2] = {PC0,PC1,PC2,PC3,PC4};
+//volatile uint8_t* PORTS[CHANNELS_1+CHANNELS_2] = {&PORTC,&PORTC,&PORTC,&PORTC,&PORTC,&PORTD,&PORTD,&PORTD,&PORTD,&PORTD};
+volatile uint8_t* PORTS[CHANNELS_1+CHANNELS_2] = {&PORTC,&PORTC,&PORTC,&PORTD,&PORTD,&PORTD};
+//volatile uint8_t* DDRS[CHANNELS_1+CHANNELS_2] = {&DDRC,&DDRC,&DDRC,&DDRC,&DDRC,&DDRD,&DDRD,&DDRD,&DDRD,&DDRD};
+volatile uint8_t* DDRS[CHANNELS_1+CHANNELS_2] = {&DDRC,&DDRC,&DDRC,&DDRD,&DDRD,&DDRD};
+//const uint8_t BITS[CHANNELS_1+CHANNELS_2] = {PC0,PC1,PC2,PC3,PC4,PD2,PD3,PD4,PD5,PD7};
+const uint8_t BITS[CHANNELS_1+CHANNELS_2] = {PC0,PC1,PC2,PD2,PD3,PD4};
 
 /* global variables */
 #define INPUT_MAX 255 /* max length for user input string */
@@ -624,6 +627,15 @@ void ir_action(uint8_t address, uint8_t command)
 						brightness[mode][channel] = 0xff;
 					}
 					printf("increasing brightness ch %u %u: %u\n",(channel/CHANNELS_1)+1,(channel%CHANNELS_1)+1,brightness[mode][channel]);
+				} else if (channel==CHANNELS_1+CHANNELS_2) {
+					for (uint8_t i=0; i<CHANNELS_1+CHANNELS_2; i++) {
+						if (brightness[mode][i]<0xff-step) {
+							brightness[mode][i] += step;
+						} else {
+							brightness[mode][i] = 0xff;
+						}
+					}
+					printf("increasing brightness all channels\n");
 				}
 				channel_flag = true;
 				break;
@@ -634,13 +646,22 @@ void ir_action(uint8_t address, uint8_t command)
 					} else {
 						brightness[mode][channel] = 0x00;
 					}
-					printf("increasing brightness ch %u %u: %u\n",(channel/CHANNELS_1)+1,(channel%CHANNELS_1)+1,brightness[mode][channel]);
+					printf("decreasing brightness ch %u %u: %u\n",(channel/CHANNELS_1)+1,(channel%CHANNELS_1)+1,brightness[mode][channel]);
+				} else if (channel==CHANNELS_1+CHANNELS_2) {
+					for (uint8_t i=0; i<CHANNELS_1+CHANNELS_2; i++) {
+						if (brightness[mode][i]>step) {
+							brightness[mode][i] -= step;
+						} else {
+							brightness[mode][i] = 0x00;
+						}
+					}
+					printf("decreasing brightness all channels\n");
 				}
 				channel_flag = true;
 				break;
 			case CHANNEL_NEXT:
-				if (channel<CHANNELS_1+CHANNELS_2) {
-					channel = (channel+1)%(CHANNELS_1+CHANNELS_2);
+				if (channel<=CHANNELS_1+CHANNELS_2) {
+					channel = (channel+1)%(CHANNELS_1+CHANNELS_2+1);
 				} else {
 					channel = 0x00;
 				}
@@ -648,7 +669,7 @@ void ir_action(uint8_t address, uint8_t command)
 				break;
 			case CHANNEL_PREVIOUS:
 				if (0==channel) {
-					channel = CHANNELS_1+CHANNELS_2-1;
+					channel = CHANNELS_1+CHANNELS_2;
 				} else {
 					channel--;
 				}
diff --git a/firmware/main.h b/firmware/main.h
index 5cffe39..39ab269 100644
--- a/firmware/main.h
+++ b/firmware/main.h
@@ -24,8 +24,10 @@
 #define nPS_ON PB2 /* ATX power supply ON switch */
 
 /* channel definitions */
-#define CHANNELS_1 5 /* the number of outputs for channel 1 */
-#define CHANNELS_2 5 /* the number of outputs for channel 2 */
+//#define CHANNELS_1 5 /* the number of outputs (zo use) for channel 1 (up to 5) */
+#define CHANNELS_1 3 /* the number of outputs (zo use) for channel 1 (up to 5) */
+//#define CHANNELS_2 5 /* the number of outputs (to use) for channel 2 (up tp 5) */
+#define CHANNELS_2 3 /* the number of outputs (to use) for channel 2 (up tp 5) */
 extern volatile uint8_t* PORTS[CHANNELS_1+CHANNELS_2]; /* channel ports */
 extern volatile uint8_t* DDRS[CHANNELS_1+CHANNELS_2]; /* channel I/O configuration registers */
 extern const uint8_t BITS[CHANNELS_1+CHANNELS_2]; /* channel bits */