diff --git a/etc/wavpcm/build.sh b/etc/wavpcm/build.sh
new file mode 100755
index 0000000..6a61b18
--- /dev/null
+++ b/etc/wavpcm/build.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+echo "Formatting.."
+clang-format -i wavpcm.c
+
+echo "Cleaning.."
+rm -f ../../bin/wavpcm
+
+echo "Building.."
+mkdir -p ../../bin
+cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined -lm wavpcm.c -o ../../bin/wavpcm
+
+echo "Running.."
+../../bin/wavpcm
+
+echo "Done."
diff --git a/etc/wavpcm/wavpcm.c b/etc/wavpcm/wavpcm.c
new file mode 100644
index 0000000..c9b83f2
--- /dev/null
+++ b/etc/wavpcm/wavpcm.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <math.h>
+
+/* 
+Copyright (c) 2020 Devine Lu Linvega
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE.
+*/
+
+#define PI 3.14159265358979323846
+#define SAMPLES 256
+#define RATE 1
+
+typedef unsigned char Uint8;
+
+int
+clamp(int val, int min, int max)
+{
+	return (val >= min) ? (val <= max) ? val : max : min;
+}
+
+Uint8
+sinw(int i)
+{
+	return 0x7f * sin(i * RATE * 2 * PI / SAMPLES);
+}
+
+Uint8
+triw(int i)
+{
+	if(i < 0x40)
+		return i * 2;
+	if(i >= 0xc0)
+		return (i - 0xc0) * 2 - 0x7f;
+	return 0x7f - (i - 0x40) * 2;
+}
+
+Uint8
+sqrw(int i)
+{
+	return ((i * RATE) % 0xff) < 0x80 ? 0x7f : 0x80;
+}
+
+int
+main()
+{
+	int i;
+	printf("%d:\n\n", SAMPLES);
+	for(i = 0; i < SAMPLES; ++i) {
+		if(i % 0x10 == 0)
+			printf("\n");
+		else if(i % 2 == 0)
+			printf(" ");
+		printf("%02x", (triw(i) + sinw(i)) / 2);
+	}
+	printf("\n\n");
+	return 0;
+}
diff --git a/projects/demos/piano.usm b/projects/demos/piano.usm
index 66b7867..4aece31 100644
--- a/projects/demos/piano.usm
+++ b/projects/demos/piano.usm
@@ -8,6 +8,8 @@
 %TOS { #00 SWP }
 %MOD { DUP2 DIV MUL SUB }
 
+%WAVEFORM { #1000 }
+
 ( devices )
 
 |00 @System     [ &vector $2 &pad      $6 &r      $2 &g     $2 &b      $2 ]
@@ -20,6 +22,7 @@
 |70 @Midi       [ &vector $2 &channel  $1 &note   $1 &velocity $1 ]
 |80 @Controller [ &vector $2 &button   $1 &key    $1 ]
 |90 @Mouse      [ &vector $2 &x        $2 &y      $2 &state $1 &chord  $1 ]
+|a0 @File       [ &vector $2 &success  $2 &offset $2 &pad   $2 &name  $2 &length $2 &load $2 &save $2 ]
 
 ( variables )
 
@@ -51,34 +54,49 @@
 	;on-midi .Midi/vector DEO2
 	;on-frame .Screen/vector DEO2
 
+	( load waveform )
+	;sin-path .File/name DEO2 #0100 .File/length DEO2 WAVEFORM .File/load DEO2
+	;tri-path .File/name DEO2 #0100 .File/length DEO2 WAVEFORM #0100 ADD2 .File/load DEO2
+	;sqr-path .File/name DEO2 #0100 .File/length DEO2 WAVEFORM #0200 ADD2 .File/load DEO2
+
 	( find center )
 	.Screen/width DEI2 2/ .center/x POK2
 	.Screen/height DEI2 2/ .center/y POK2
 
 	( place octave )
-	.center/x PEK2 #0050 SUB2 .octave-view/x1 POK2
+	.center/x PEK2 #0080 SUB2 .octave-view/x1 POK2
 	.center/y PEK2 8+ .octave-view/y1 POK2
-	.octave-view/x1 PEK2 #0048 ADD2 .octave-view/x2 POK2
+	.octave-view/x1 PEK2 #0050 ADD2 .octave-view/x2 POK2
 	.octave-view/y1 PEK2 #0018 ADD2 .octave-view/y2 POK2
 
 	( place adsr )
-	.center/x PEK2 .adsr-view/x1 POK2
+	.center/x PEK2 #0020 SUB2 .adsr-view/x1 POK2
 	.center/y PEK2 8+ .adsr-view/y1 POK2
-	.adsr-view/x1 PEK2 #0058 ADD2 .adsr-view/x2 POK2
+	.adsr-view/x1 PEK2 #00a0 ADD2 .adsr-view/x2 POK2
 	.adsr-view/y1 PEK2 #0018 ADD2 .adsr-view/y2 POK2
 
 	( place waveform )
-	.center/x PEK2 #0050 SUB2 .wave-view/x1 POK2
+	.center/x PEK2 #0080 SUB2 .wave-view/x1 POK2
 	.center/y PEK2 #0020 SUB2 .wave-view/y1 POK2
-	.wave-view/x1 PEK2 #00a8 ADD2 .wave-view/x2 POK2
+	.wave-view/x1 PEK2 #0100 ADD2 .wave-view/x2 POK2
 	.wave-view/y1 PEK2 #0020 ADD2 .wave-view/y2 POK2
 
 	( default settings )
 	#ff .last-note POK
 	#048c .Audio0/adsr DEO2
 	#88 .Audio0/volume DEO
-	;sine-wave .Audio0/addr DEO2
-	;sine-wave/end ;sine-wave SUB2 #0001 SFT2 .Audio0/length DEO2
+	WAVEFORM .Audio0/addr DEO2
+	#0100 .Audio0/length DEO2
+
+	#011a .Audio1/adsr DEO2
+	#88 .Audio1/volume DEO
+	WAVEFORM #0100 ADD2 .Audio1/addr DEO2
+	#0100 .Audio1/length DEO2
+
+	#1118 .Audio2/adsr DEO2
+	#88 .Audio2/volume DEO
+	WAVEFORM #0200 ADD2 .Audio2/addr DEO2
+	#0100 .Audio2/length DEO2
 
 	( inital drawing ) 
 	;draw-octave JSR2
@@ -132,7 +150,7 @@ BRK
 
 @on-touch-octave-view ( -> )
 
-	.Mouse/x DEI2 .octave-view/x1 PEK2 SUB2 8/ SWP POP #08 NEQ ,&no-mod JNZ
+	.Mouse/x DEI2 .octave-view/x1 PEK2 SUB2 8/ SWP POP #09 NEQ ,&no-mod JNZ
 		.Mouse/y DEI2 .octave-view/y1 PEK2 SUB2 8/ SWP POP 
 		DUP #00 NEQ ,&no-incr JNZ
 			.octave PEK #01 ADD .octave POK &no-incr
@@ -144,10 +162,11 @@ BRK
 		BRK
 	&no-mod
 
-	.Mouse/x DEI2 .octave-view/x1 PEK2 SUB2 8/ DUP2 SWP POP .last-note POK ;notes ADD2 GET ;play JSR2
-
-	( release ) #00 .Mouse/state DEO
-	;draw-octave JSR2
+	.Mouse/x DEI2 .octave-view/x1 PEK2 SUB2 8/ SWP POP #06 GTH ,&no-key JNZ
+		.Mouse/x DEI2 .octave-view/x1 PEK2 SUB2 8/ DUP2 SWP POP .last-note POK ;notes ADD2 GET ;play JSR2
+		( release ) #00 .Mouse/state DEO
+		;draw-octave JSR2
+	&no-key
 
 BRK 
 
@@ -170,6 +189,14 @@ BRK
 		.Audio0/adsr #01 ADD DEI
 		DUP #f0 AND STH #01 .Mouse/state DEI #10 EQU #0e MUL ADD ADD #0f AND STHr ADD
 		.Audio0/adsr #01 ADD DEO &no-r
+	DUP #05 NEQ ,&no-left JNZ
+		.Audio0/volume DEI 
+		#10 .Mouse/state DEI #10 EQU #e0 MUL ADD ADD
+		.Audio0/volume DEO &no-left
+	DUP #06 NEQ ,&no-right JNZ
+		.Audio0/volume DEI
+		DUP #f0 AND STH #01 .Mouse/state DEI #10 EQU #0e MUL ADD ADD #0f AND STHr ADD
+		.Audio0/volume DEO &no-right
 	POP
 
 	( release ) #00 .Mouse/state DEO
@@ -223,7 +250,7 @@ BRK
 
 @play ( pitch -- )
 	
-	.octave PEK #0c MUL ADD .Audio0/pitch DEO
+	DUP .octave PEK #0c MUL ADD .Audio0/pitch DEO
 
 RTN
 
@@ -258,8 +285,9 @@ RTN
 	OVR2 #0028 ADD2 OVR2 ;keys-middle-icns #21 .last-note PEK #05 EQU ADD ;draw-key JSR2
 	SWP2 #0030 ADD2 SWP2 ;keys-right-icns #21 .last-note PEK #06 EQU ADD ;draw-key JSR2
 
+	.octave-view/x1 PEK2 #0048 ADD2 .Screen/x DEO2
+
 	;arrow-icns .Screen/addr DEO2
-	.octave-view/x1 PEK2 #0040 ADD2 .Screen/x DEO2
 	.octave-view/y1 PEK2 .Screen/y DEO2
 	#21 .Screen/color DEO
 
@@ -268,7 +296,6 @@ RTN
 	#21 .Screen/color DEO
 
 	;font-hex .octave PEK #03 ADD #00 SWP #0008 MUL2 ADD2 .Screen/addr DEO2
-	.octave-view/x2 PEK2 #0008 SUB2 .Screen/x DEO2
 	.octave-view/y1 PEK2 8+ .Screen/y DEO2
 	#23 .Screen/color DEO
 
@@ -306,6 +333,14 @@ RTN
 		.Audio0/adsr #01 ADD DEI #0f AND
 		;draw-knob JSR2
 
+	( volume )
+	.adsr-view/x2 PEK2 #0028 SUB2 .adsr-view/y1 PEK2
+		.Audio0/volume DEI #04 SFT
+		;draw-knob JSR2
+	.adsr-view/x2 PEK2 #0010 SUB2 .adsr-view/y1 PEK2
+		.Audio0/volume DEI #0f AND
+		;draw-knob JSR2
+
 RTN
 
 @draw-wave ( -- )
@@ -321,7 +356,7 @@ RTN
 	.wave-view/x1 PEK2 .Screen/x DEO2
 
 	( waveform )
-	#00 #a8
+	#00 #ff
 	&loop
 		( dotted line )
 		OVR #01 AND ,&no-dot JNZ 
@@ -490,38 +525,6 @@ RTN
 	007c 8280 8080 827c 00fc 8282 8282 82fc
 	007c 8280 f080 827c 007c 8280 f080 8080 ]
 
-@sine-wave [
-	0004 090e 1217 1c20 2529 2e32 363b 3f43 
-	474b 4e52 5659 5c60 6365 686b 6d70 7274 
-	7677 797a 7b7c 7d7e 7e7e 7e7e 7e7e 7d7c
-	7b7a 7978 7674 7270 6e6b 6966 6360 5d5a 
-	5753 4f4c 4844 403c 3833 2f2a 2621 1d18 
-	140f 0a05 01fc f7f2 eee9 e4e0 dbd7 d2ce
-	cac5 c1bd b9b5 b1ae aaa7 a3a0 9d9a 9795 
-	9290 8e8c 8a88 8785 8483 8282 8181 8181 
-	8181 8282 8384 8687 898a 8c8e 9193 9598
-	9b9e a1a4 a8ab afb2 b6ba bec2 c6cb cfd3 
-	d8dc e1e6 eaef f4f8 ] &end
-
-@tri-wave [
-	0002 0406 080a 0c0e 1012 1416 181a 1c1e 
-	2022 2426 282a 2c2e 3032 3436 383a 3c3e 
-	4041 4345 4749 4b4d 4f51 5355 5759 5b5d
-	5f61 6365 6769 6b6d 6f71 7375 7779 7b7d 
-	7f7d 7b79 7775 7371 6f6d 6b69 6765 6361 
-	5f5d 5b59 5755 5351 4f4d 4b49 4745 4341
-	403e 3c3a 3836 3432 302e 2c2a 2826 2422 
-	201e 1c1a 1816 1412 100e 0c0a 0806 0402 
-	00fe fcfa f8f6 f4f2 f0ee ecea e8e6 e4e2
-	e0de dcda d8d6 d4d2 d0ce ccca c8c6 c4c2 
-	c1bf bdbb b9b7 b5b3 ]
-
-@arc [
-	8000 8d00 9a02 a706 b40b c011 cb18 d520
-	df2a e734 ee40 f44b f958 fd65 ff72 ff80
-	ff8d fd9a f9a7 f4b4 eec0 e7cb dfd5 d5df
-	cbe7 c0ee b4f4 a7f9 9afd 8dff 80ff 72ff
-	65fd 58f9 4bf4 40ee 34e7 2adf 20d5 18cb
-	11c0 0bb4 06a7 029a 008d 0080 0072 0265
-	0658 0b4b 113f 1834 202a 2a20 3418 3f11
-	4b0b 5806 6502 7200 ]
\ No newline at end of file
+@sin-path "projects/sounds/sin.pcm $1
+@tri-path "projects/sounds/tri.pcm $1
+@sqr-path "projects/sounds/sqr.pcm $1
\ No newline at end of file
diff --git a/projects/sounds/sin.pcm b/projects/sounds/sin.pcm
new file mode 100644
index 0000000..7ec741c
Binary files /dev/null and b/projects/sounds/sin.pcm differ
diff --git a/projects/sounds/sqr.pcm b/projects/sounds/sqr.pcm
new file mode 100644
index 0000000..3aa80c7
--- /dev/null
+++ b/projects/sounds/sqr.pcm
@@ -0,0 +1 @@
+€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€
\ No newline at end of file
diff --git a/projects/sounds/tri.pcm b/projects/sounds/tri.pcm
new file mode 100644
index 0000000..48c4940
Binary files /dev/null and b/projects/sounds/tri.pcm differ