diff --git a/public/src/css/game.css b/public/src/css/game.css
index 5708555..8416bbe 100644
--- a/public/src/css/game.css
+++ b/public/src/css/game.css
@@ -5,7 +5,7 @@
 	background-size: cover;
 }
 #game.default-bg{
-	background-size: contain;
+	background-size: calc(100vh / 720 * 512);
 }
 #canvas{
 	position: relative;
diff --git a/public/src/css/main.css b/public/src/css/main.css
index 032f7c4..3ee4261 100644
--- a/public/src/css/main.css
+++ b/public/src/css/main.css
@@ -190,17 +190,18 @@ kbd{
 }
 @keyframes bgscroll{
 	from{
-		background-position: 0 0;
+		background-position: 0 center;
 	}
 	to{
-		background-position: calc(-100vh / 720 * 512) 0;
+		background-position: calc(-100vh / 720 * 512) center;
 	}
 }
 #song-select{
 	width: 100%;
 	height: 100%;
 	background-image: url("/assets/img/bg_genre_0.png");
-	background-size: contain;
+	background-size: calc(100vh / 720 * 512);
+	background-repeat: repeat no-repeat;
 	animation: bgscroll 16s infinite linear;
 	white-space: nowrap;
 	transition: background-image 0.5s;
diff --git a/public/src/js/mekadon.js b/public/src/js/mekadon.js
index 2864a82..2de0163 100644
--- a/public/src/js/mekadon.js
+++ b/public/src/js/mekadon.js
@@ -8,7 +8,7 @@ class Mekadon{
 	play(circle){
 		var type = circle.getType()
 		if((type === "balloon" || type === "drumroll" || type === "daiDrumroll") && this.getMS() > circle.getEndTime()){
-			circle.played(0, false)
+			circle.played(-1, false)
 			this.game.updateCurrentCircle()
 		}
 		type = circle.getType()
diff --git a/public/src/js/parsesong.js b/public/src/js/parsesong.js
index 1b44ff2..5f9ad12 100644
--- a/public/src/js/parsesong.js
+++ b/public/src/js/parsesong.js
@@ -122,7 +122,8 @@ class ParseSong{
 				start: start,
 				sliderMultiplier: sliderMultiplier,
 				measure: parseInt(values[this.osu.METER]),
-				gogoTime: parseInt(values[this.osu.KIAIMODE])
+				gogoTime: parseInt(values[this.osu.KIAIMODE]),
+				beatLength: msOrPercent
 			})
 		}
 		return timingPoints
@@ -233,12 +234,14 @@ class ParseSong{
 			var gogoTime = false
 			var osuType = parseInt(values[this.osu.TYPE])
 			var hitSound = parseInt(values[this.osu.HITSOUND])
+			var beatLength = speed
 			
 			for(var j = 0; j < this.timingPoints.length; j++){
 				if(this.timingPoints[j].start > start){
 					break
 				}
 				speed = this.timingPoints[j].sliderMultiplier
+				beatLength = this.timingPoints[j].beatLength
 				gogoTime = this.timingPoints[j].gogoTime
 			}
 			
@@ -261,8 +264,14 @@ class ParseSong{
 			}else if(osuType & this.osu.SLIDER){
 				
 				var extras = values.slice(this.osu.EXTRAS)
-				var pixelLength = parseFloat(extras[this.osu.PIXELLENGTH])
-				var endTime = start + pixelLength / (speed * 100) * this.beatInfo.beatInterval
+				var distance = parseFloat(extras[this.osu.PIXELLENGTH])
+				
+				var speedMultiplier = beatLength < 0 ? 100.0 / -beatLength : 1
+				var speedAdjustedBeatLength = this.beatInfo.beatInterval / speedMultiplier
+				var taikoVelocity = 100 * this.difficulty.sliderMultiplier / speedAdjustedBeatLength
+				var taikoDuration = distance / taikoVelocity
+				var endTime = start + taikoDuration
+				
 				if(hitSound & this.osu.FINISH){
 					type = "daiDrumroll"
 					txt = "連打(大)ーっ!!"
diff --git a/public/src/js/scoresheet.js b/public/src/js/scoresheet.js
index 2393077..02a89cf 100644
--- a/public/src/js/scoresheet.js
+++ b/public/src/js/scoresheet.js
@@ -121,6 +121,7 @@ class Scoresheet{
 			selected.click()
 		}else if(code == 37 || code == 39 || code == 67 || code == 78){
 			// Left, Right, C, N
+			assets.sounds["ka"].play()
 			selected.classList.remove("selected")
 			var next = selected.nextElementSibling
 			if(!next){
@@ -130,6 +131,7 @@ class Scoresheet{
 		}
 	}
 	clean(){
+		this.gamepad.clean()
 		assets.sounds["bgm_result"].stop()
 		pageEvents.keyRemove(this, "all")
 		pageEvents.remove(window, "resize")