diff --git a/pt3_player/Makefile b/pt3_player/Makefile
index d26aba1e..8547d29e 100644
--- a/pt3_player/Makefile
+++ b/pt3_player/Makefile
@@ -39,7 +39,7 @@ PT3_PLAYER:	pt3_player.o
 	ld65 -o PT3_PLAYER pt3_player.o -C ../linker_scripts/apple2_1000.inc
 
 pt3_player.o:	pt3_player.s \
-	gr_fast_clear.s pt3_lib.s
+	gr_fast_clear.s pt3_lib.s interrupt_handler.s
 #	mockingboard.s \
 #	keypress_minimal.s \
 #	qkumba_rts.s \
diff --git a/pt3_player/interrupt_handler.s b/pt3_player/interrupt_handler.s
index 1f36d108..b5018ee6 100644
--- a/pt3_player/interrupt_handler.s
+++ b/pt3_player/interrupt_handler.s
@@ -22,14 +22,16 @@ interrupt_handler:
 
 
 
-;	inc	$0404		; debug (flashes char onscreen)
+	inc	$0404		; debug (flashes char onscreen)
 
 	bit	$C404		; clear 6522 interrupt by reading T1C-L	; 4
 
 
-	lda	DONE_PLAYING						; 3
-	beq	mb_play_music	; if song done, don't play music	; 3/2nt
-	jmp	check_keyboard						; 3
+	jmp	exit_interrupt
+
+;	lda	DONE_PLAYING						; 3
+;	beq	mb_play_music	; if song done, don't play music	; 3/2nt
+;	jmp	check_keyboard						; 3
 								;============
 								;	13
 
diff --git a/pt3_player/pt3_lib.s b/pt3_player/pt3_lib.s
index 1ca3d70b..553ad9ec 100644
--- a/pt3_player/pt3_lib.s
+++ b/pt3_player/pt3_lib.s
@@ -48,6 +48,10 @@ pt3_envelope_type:	.byte	$0
 pt3_current_pattern:	.byte	$0
 pt3_music_len:		.byte	$0
 
+; Header offsets
+
+PT3_HEADER_FREQUENCY = $63
+
 load_ornament:
 	rts
 
@@ -91,6 +95,44 @@ pt3_init_song:
 
 	rts
 
+	;=====================================
+	; Calculate Note
+	;=====================================
+CalculateNote:
+
+	rts
+
+	;=====================================
+	; Decode Note
+	;=====================================
+
+DecodeNote:
+
+	rts
+
+
+	;======================================
+	; GetNoteFreq
+	;======================================
+
+	; Return frequency from lookup table
+	; Which note is in Y
+	; return in X,A (high,low)
+GetNoteFreq:
+	lda	PT3_LOC+PT3_HEADER_FREQUENCY
+	cmp	#1
+	bne	freq_table_2
+
+	lda	PT3NoteTable_ST_high,Y
+	tax
+	lda	PT3NoteTable_ST_low,Y
+	rts
+
+freq_table_2:
+	lda	PT3NoteTable_ASM_34_35_high,Y
+	tax
+	lda	PT3NoteTable_ASM_34_35_low,Y
+        rts
 
 
 
@@ -139,7 +181,7 @@ PT3NoteTable_ASM_34_35_high:
 .byte $00,$00,$00,$00,$00,$00,$00,$00
 .byte $00,$00,$00,$00,$00,$00,$00,$00
 
-PT3NoteTable_ASM_34_35_lo:
+PT3NoteTable_ASM_34_35_low:
 .byte $10,$55,$A4,$FC,$5F,$CA,$3D,$B8
 .byte $3B,$C5,$55,$EC,$88,$2A,$D2,$7E
 .byte $2F,$E5,$9E,$5C,$1D,$E2,$AB,$76
diff --git a/pt3_player/pt3_player.s b/pt3_player/pt3_player.s
index f371a250..21c77e37 100644
--- a/pt3_player/pt3_player.s
+++ b/pt3_player/pt3_player.s
@@ -23,10 +23,10 @@ pt3_setup:
 	; init variables
 
 	lda	#0
-;	sta	DRAW_PAGE
+	sta	DRAW_PAGE
 ;	sta	CH
 ;	sta	CV
-;	sta	DONE_PLAYING
+	sta	DONE_PLAYING
 ;	sta	MB_CHUNK_OFFSET
 ;	sta	DECODE_ERROR
 	sta	WHICH_FILE
@@ -77,10 +77,10 @@ mockingboard_found:
 	; Vector address goes to 0x3fe/0x3ff
 	; FIXME: should chain any existing handler
 
-;	lda	#<interrupt_handler
-;	sta	$03fe
-;	lda	#>interrupt_handler
-;	sta	$03ff
+	lda	#<interrupt_handler
+	sta	$03fe
+	lda	#>interrupt_handler
+	sta	$03ff
 
 	;============================
 	; Enable 50Hz clock on 6522
@@ -152,7 +152,7 @@ mockingboard_found:
 	; Enable 6502 interrupts
 	;============================
 
-;	cli		; clear interrupt mask
+	cli		; clear interrupt mask
 
 
 	;============================