diff --git a/firmware/apps/crazy_synth.c b/firmware/apps/crazy_synth.c
index d0dc7fb..b591a6a 100644
--- a/firmware/apps/crazy_synth.c
+++ b/firmware/apps/crazy_synth.c
@@ -1,129 +1,12 @@
 #include <inttypes.h>
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#define __DELAY_BACKWARD_COMPATIBLE__
-#include <util/delay.h>
 #include <stdlib.h>
-#include <avr/pgmspace.h>
-#include "freq_table.h"
-#include <lib/bughal.h> 
+#include <avr/io.h>
 
 #include "../lib/apps.h"
-
-
-static uint16_t	osc0     ;
-static uint16_t	osc1     ;
-static uint16_t	sample   ;
-static uint8_t	row      ;
-static uint16_t	speedtime;
-
-
-void synth_init(void){
-	cli();
-	osc0 = osc1 = sample = row = 0;
-	speedtime = 3000;
-
-	/* set timer0 to CTC & prescaler 64 → 125kHz increment */
-	TCCR0A = (1 << WGM01);
-	TCCR0B = (1 << CS00) | (1 << CS01);
-
-	OCR0A = 4;  /* TOP */
-	TCNT0 = 0;
-
-	/*enable interrupt */
-	TIMSK0 |= (1 << OCIE0A);
-
-	sei();
-	return;
-}
-
-
-void synth_deinit(void) {
-	cli();
-	TIMSK0 = 0;
-	sei();
-	return;
-}
-
-enum {
-	SONG_LENGTH = 128,
-	xxx = 0,
-	c_0 = 0, cs0 = 1, d_0 = 2, ds0 = 3, e_0 = 4, f_0 = 5,
-	fs0 = 6, g_0 = 7, gs0 = 8, a_0 = 9, as0 = 10, b_0 = 11,
-	c_1 = 12, cs1 = 13, d_1 = 14, ds1 = 15, e_1 = 16, f_1 = 17,
-	fs1 = 18, g_1 = 19, gs1 = 20, a_1 = 21, as1 = 22, b_1 = 23,
-	c_2 = 24, cs2 = 25, d_2 = 26, ds2 = 27, e_2 = 28, f_2 = 29,
-	fs2 = 30, g_2 = 31, gs2 = 32, a_2 = 33, as2 = 34, b_2 = 35,
-	c_3 = 36, cs3 = 37, d_3 = 38, ds3 = 39, e_3 = 40, f_3 = 41,
-	fs3 = 42, g_3 = 43, gs3 = 44, a_3 = 45, as3 = 46, b_3 = 47,
-};
-
-const char music_data[2][SONG_LENGTH] PROGMEM = {
-	{
-		e_1, xxx, e_2, xxx, e_1, xxx, e_2, xxx,
-		e_1, xxx, e_2, xxx, e_1, xxx, e_2, xxx,
-		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
-		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
-		gs0, xxx, gs1, xxx, gs0, xxx, gs1, xxx,
-		gs0, xxx, gs1, xxx, gs0, xxx, gs1, xxx,
-		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
-		a_0, xxx, a_0, xxx, b_0, xxx, c_1, xxx,
-		d_1, xxx, d_2, xxx, d_1, xxx, d_2, xxx,
-		d_1, xxx, d_2, xxx, d_1, xxx, d_2, xxx,
-		c_1, xxx, c_2, xxx, c_1, xxx, c_2, xxx,
-		c_1, xxx, c_2, xxx, c_1, xxx, c_2, xxx,
-		b_0, xxx, b_1, xxx, b_0, xxx, b_1, xxx,
-		b_0, xxx, b_1, xxx, b_0, xxx, b_1, xxx,
-		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
-		a_0, xxx, xxx, xxx, xxx, xxx, xxx, xxx,
-	}, {
-		e_3, e_3, e_3, e_3, b_2, b_2, c_3, c_3,
-		d_3, d_3, e_3, d_3, c_3, c_3, b_2, b_2,
-		a_2, a_2, a_2, a_2, a_2, a_2, c_3, c_3,
-		e_3, e_3, e_3, e_3, d_3, d_3, c_3, c_3,
-		b_2, b_2, b_2, b_2, b_2, b_2, c_3, c_3,
-		d_3, d_3, d_3, d_3, e_3, e_3, e_3, e_3,
-		c_3, c_3, c_3, c_3, a_2, a_2, a_2, a_2,
-		a_2, a_2, a_2, a_2, a_2, a_2, a_2, a_2,
-		xxx, xxx, d_3, d_3, d_3, d_3, f_3, f_3,
-		a_3, a_3, a_3, a_3, g_3, g_3, f_3, f_3,
-		e_3, e_3, e_3, e_3, e_3, e_3, c_3, c_3,
-		e_3, e_3, e_3, e_3, d_3, d_3, c_3, c_3,
-		b_2, b_2, b_2, b_2, b_2, b_2, c_3, c_3,
-		d_3, d_3, d_3, d_3, e_3, e_3, e_3, e_3,
-		c_3, c_3, c_3, c_3, a_2, a_2, a_2, a_2,
-		a_2, a_2, a_2, a_2, xxx, xxx, xxx, xxx,
-	}
-};
-
-
-
-
-ISR(TIMER0_COMPA_vect,ISR_NOBLOCK)
-{
-	osc0 += pgm_read_word(&freq_table[ pgm_read_byte(&music_data[0][row])]);
-	osc1 += pgm_read_word(&freq_table[ pgm_read_byte(&music_data[1][row])]);
-	if (++sample == speedtime ) {
-		sample = 0;
-
-		if (speedtime > 600) speedtime -= 4;
-		if (++row == SONG_LENGTH) {
-			row = 0;
-			if (speedtime <= 600) speedtime = 3000;
-		}
-		if (row&4){
-			led_on(LED_R);
-			led_off(LED_L);
-		}else{
-			led_on(LED_L);
-			led_off(LED_R);
-		}	}
-
-	if (osc0 >= 0x8000) PORTB |= (1 << PORTB2);
-	else PORTB &= ~(1<< PORTB2);
-	if (osc1 >= 0xc000) PORTC |= (1 << PORTC5);
-	else PORTC &= ~(1<< PORTC5);
-}
+#include "../lib/bughal.h"
+#include "../lib/util.h"
+#include "../lib/music.h"
+#include "../lib/synth.h"
 
 /**
  * do crazy synthesizer mode
diff --git a/firmware/lib/synth.c b/firmware/lib/synth.c
new file mode 100644
index 0000000..c168330
--- /dev/null
+++ b/firmware/lib/synth.c
@@ -0,0 +1,125 @@
+#include <inttypes.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#define __DELAY_BACKWARD_COMPATIBLE__
+#include <util/delay.h>
+#include <stdlib.h>
+#include <avr/pgmspace.h>
+#include "freq_table.h"
+#include <lib/bughal.h> 
+
+
+
+static uint16_t	osc0     ;
+static uint16_t	osc1     ;
+static uint16_t	sample   ;
+static uint8_t	row      ;
+static uint16_t	speedtime;
+
+
+void synth_init(void){
+	cli();
+	osc0 = osc1 = sample = row = 0;
+	speedtime = 3000;
+
+	/* set timer0 to CTC & prescaler 64 → 125kHz increment */
+	TCCR0A = (1 << WGM01);
+	TCCR0B = (1 << CS00) | (1 << CS01);
+
+	OCR0A = 4;  /* TOP */
+	TCNT0 = 0;
+
+	/*enable interrupt */
+	TIMSK0 |= (1 << OCIE0A);
+
+	sei();
+	return;
+}
+
+
+void synth_deinit(void) {
+	cli();
+	TIMSK0 = 0;
+	sei();
+	return;
+}
+
+enum {
+	SONG_LENGTH = 128,
+	xxx = 0,
+	c_0 = 0, cs0 = 1, d_0 = 2, ds0 = 3, e_0 = 4, f_0 = 5,
+	fs0 = 6, g_0 = 7, gs0 = 8, a_0 = 9, as0 = 10, b_0 = 11,
+	c_1 = 12, cs1 = 13, d_1 = 14, ds1 = 15, e_1 = 16, f_1 = 17,
+	fs1 = 18, g_1 = 19, gs1 = 20, a_1 = 21, as1 = 22, b_1 = 23,
+	c_2 = 24, cs2 = 25, d_2 = 26, ds2 = 27, e_2 = 28, f_2 = 29,
+	fs2 = 30, g_2 = 31, gs2 = 32, a_2 = 33, as2 = 34, b_2 = 35,
+	c_3 = 36, cs3 = 37, d_3 = 38, ds3 = 39, e_3 = 40, f_3 = 41,
+	fs3 = 42, g_3 = 43, gs3 = 44, a_3 = 45, as3 = 46, b_3 = 47,
+};
+
+const char music_data[2][SONG_LENGTH] PROGMEM = {
+	{
+		e_1, xxx, e_2, xxx, e_1, xxx, e_2, xxx,
+		e_1, xxx, e_2, xxx, e_1, xxx, e_2, xxx,
+		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
+		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
+		gs0, xxx, gs1, xxx, gs0, xxx, gs1, xxx,
+		gs0, xxx, gs1, xxx, gs0, xxx, gs1, xxx,
+		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
+		a_0, xxx, a_0, xxx, b_0, xxx, c_1, xxx,
+		d_1, xxx, d_2, xxx, d_1, xxx, d_2, xxx,
+		d_1, xxx, d_2, xxx, d_1, xxx, d_2, xxx,
+		c_1, xxx, c_2, xxx, c_1, xxx, c_2, xxx,
+		c_1, xxx, c_2, xxx, c_1, xxx, c_2, xxx,
+		b_0, xxx, b_1, xxx, b_0, xxx, b_1, xxx,
+		b_0, xxx, b_1, xxx, b_0, xxx, b_1, xxx,
+		a_0, xxx, a_1, xxx, a_0, xxx, a_1, xxx,
+		a_0, xxx, xxx, xxx, xxx, xxx, xxx, xxx,
+	}, {
+		e_3, e_3, e_3, e_3, b_2, b_2, c_3, c_3,
+		d_3, d_3, e_3, d_3, c_3, c_3, b_2, b_2,
+		a_2, a_2, a_2, a_2, a_2, a_2, c_3, c_3,
+		e_3, e_3, e_3, e_3, d_3, d_3, c_3, c_3,
+		b_2, b_2, b_2, b_2, b_2, b_2, c_3, c_3,
+		d_3, d_3, d_3, d_3, e_3, e_3, e_3, e_3,
+		c_3, c_3, c_3, c_3, a_2, a_2, a_2, a_2,
+		a_2, a_2, a_2, a_2, a_2, a_2, a_2, a_2,
+		xxx, xxx, d_3, d_3, d_3, d_3, f_3, f_3,
+		a_3, a_3, a_3, a_3, g_3, g_3, f_3, f_3,
+		e_3, e_3, e_3, e_3, e_3, e_3, c_3, c_3,
+		e_3, e_3, e_3, e_3, d_3, d_3, c_3, c_3,
+		b_2, b_2, b_2, b_2, b_2, b_2, c_3, c_3,
+		d_3, d_3, d_3, d_3, e_3, e_3, e_3, e_3,
+		c_3, c_3, c_3, c_3, a_2, a_2, a_2, a_2,
+		a_2, a_2, a_2, a_2, xxx, xxx, xxx, xxx,
+	}
+};
+
+
+
+
+ISR(TIMER0_COMPA_vect,ISR_NOBLOCK)
+{
+	osc0 += pgm_read_word(&freq_table[ pgm_read_byte(&music_data[0][row])]);
+	osc1 += pgm_read_word(&freq_table[ pgm_read_byte(&music_data[1][row])]);
+	if (++sample == speedtime ) {
+		sample = 0;
+
+		if (speedtime > 600) speedtime -= 4;
+		if (++row == SONG_LENGTH) {
+			row = 0;
+			if (speedtime <= 600) speedtime = 3000;
+		}
+		if (row&4){
+			led_on(LED_R);
+			led_off(LED_L);
+		}else{
+			led_on(LED_L);
+			led_off(LED_R);
+		}	}
+
+	if (osc0 >= 0x8000) PORTB |= (1 << PORTB2);
+	else PORTB &= ~(1<< PORTB2);
+	if (osc1 >= 0xc000) PORTC |= (1 << PORTC5);
+	else PORTC &= ~(1<< PORTC5);
+}
diff --git a/firmware/lib/synth.h b/firmware/lib/synth.h
new file mode 100644
index 0000000..2af7aed
--- /dev/null
+++ b/firmware/lib/synth.h
@@ -0,0 +1,5 @@
+
+void synth_init(void);
+void synth_deinit(void);
+
+
diff --git a/firmware/main.c b/firmware/main.c
index d57ba4a..f1d59dd 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -14,6 +14,7 @@
 #include "lib/bughal.h"
 #include "lib/util.h"
 #include "lib/music.h"
+#include "lib/synth.h"
 
 #include "lib/apps.h"