/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1");

/**** 
* Classes
****/ 
var GridCell = Container.expand(function (trackIndex, stepIndex, soundId) {
	var self = Container.call(this);
	self.trackIndex = trackIndex;
	self.stepIndex = stepIndex;
	self.soundId = soundId;
	self.isActive = false;
	var cellBg = self.attachAsset('gridCell', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var activeBeat = self.attachAsset('activeBeat', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0
	});
	self.setActive = function (active) {
		self.isActive = active;
		if (active) {
			activeBeat.alpha = 1;
			tween(activeBeat, {
				scaleX: 1.1,
				scaleY: 1.1
			}, {
				duration: 100,
				easing: tween.easeOut
			});
			tween(activeBeat, {
				scaleX: 1,
				scaleY: 1
			}, {
				duration: 100,
				easing: tween.easeIn
			});
		} else {
			activeBeat.alpha = 0;
		}
	};
	self.highlight = function () {
		if (self.isActive) {
			tween(activeBeat, {
				scaleX: 1.2,
				scaleY: 1.2
			}, {
				duration: 50,
				easing: tween.easeOut
			});
			tween(activeBeat, {
				scaleX: 1,
				scaleY: 1
			}, {
				duration: 100,
				easing: tween.easeIn
			});
		}
	};
	self.down = function (x, y, obj) {
		self.setActive(!self.isActive);
		if (self.isActive) {
			LK.getSound(self.soundId).play();
		}
	};
	return self;
});
var Track = Container.expand(function (trackIndex, soundId, color, name) {
	var self = Container.call(this);
	self.trackIndex = trackIndex;
	self.soundId = soundId;
	self.cells = [];
	var trackBg = self.attachAsset('trackBackground', {
		anchorX: 0,
		anchorY: 0.5,
		tint: color
	});
	trackBg.alpha = 0.3;
	trackBg.y = 0;
	var trackLabel = new Text2(name, {
		size: 32,
		fill: 0xFFFFFF
	});
	trackLabel.anchor.set(0, 0.5);
	trackLabel.x = -30;
	trackLabel.y = 0;
	self.addChild(trackLabel);
	for (var i = 0; i < 12; i++) {
		var cell = new GridCell(trackIndex, i, soundId);
		cell.x = 150 + i * 160;
		cell.y = 0;
		self.addChild(cell);
		self.cells.push(cell);
	}
	self.playStep = function (stepIndex) {
		if (self.cells[stepIndex].isActive) {
			LK.getSound(self.soundId).play();
			self.cells[stepIndex].highlight();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0d1117
});

/**** 
* Game Code
****/ 
// Initialize sound assets for each track
var isPlaying = false;
var currentStep = 0;
var bpm = 115;
var stepDuration = 60 / bpm / 4 * 1000;
var lastStepTime = 0;
var tracks = [];
var trackData = [{
	soundId: 'kick',
	color: 0xFF5722,
	name: 'KICK'
}, {
	soundId: 'snare',
	color: 0x2196F3,
	name: 'SNARE'
}, {
	soundId: 'hihat',
	color: 0xFFC107,
	name: 'HI-HAT'
}, {
	soundId: 'bass',
	color: 0x9C27B0,
	name: 'BASS'
}, {
	soundId: 'synth',
	color: 0x00BCD4,
	name: 'RIM'
}, {
	soundId: 'lead',
	color: 0x8BC34A,
	name: 'CLAP'
}];
// Create tracks - center vertically on screen
var totalTracksHeight = trackData.length * 100;
var startY = (2732 - totalTracksHeight) / 2;
for (var i = 0; i < trackData.length; i++) {
	var track = new Track(i, trackData[i].soundId, trackData[i].color, trackData[i].name);
	track.x = 32;
	track.y = startY + i * 100;
	game.addChild(track);
	tracks.push(track);
}
// Create playhead
var playhead = game.attachAsset('playhead', {
	anchorX: 0.5,
	anchorY: 0
});
playhead.x = 150 + 32;
playhead.y = startY - 50;
// Create play/pause button
var playButton = game.attachAsset('playButton', {
	anchorX: 0.5,
	anchorY: 0.5
});
playButton.x = 1024;
playButton.y = 350;
var pauseButton = game.attachAsset('pauseButton', {
	anchorX: 0.5,
	anchorY: 0.5,
	alpha: 0
});
pauseButton.x = 1024;
pauseButton.y = 350;
// BPM display
var bpmText = new Text2('BPM: ' + bpm, {
	size: 48,
	fill: 0xFFFFFF
});
bpmText.anchor.set(0.5, 0.5);
bpmText.x = 1024;
bpmText.y = 500;
game.addChild(bpmText);
// Step counter
var stepText = new Text2('Step: 1/12', {
	size: 48,
	fill: 0xFFFFFF
});
stepText.anchor.set(0.5, 0.5);
stepText.x = 1024;
stepText.y = 600;
game.addChild(stepText);
// BPM controls
var bpmUpButton = new Text2('+', {
	size: 100,
	fill: 0x4CAF50
});
bpmUpButton.anchor.set(0.5, 0.5);
bpmUpButton.x = 1100;
bpmUpButton.y = 700;
game.addChild(bpmUpButton);
var bpmDownButton = new Text2('-', {
	size: 100,
	fill: 0xFF5722
});
bpmDownButton.anchor.set(0.5, 0.5);
bpmDownButton.x = 950;
bpmDownButton.y = 700;
game.addChild(bpmDownButton);
function togglePlayback() {
	isPlaying = !isPlaying;
	if (isPlaying) {
		playButton.alpha = 0;
		pauseButton.alpha = 1;
		lastStepTime = Date.now();
	} else {
		playButton.alpha = 1;
		pauseButton.alpha = 0;
	}
}
function changeBPM(delta) {
	bpm = Math.max(60, Math.min(200, bpm + delta));
	stepDuration = 60 / bpm / 4 * 1000;
	bpmText.setText('BPM: ' + bpm);
}
playButton.down = function (x, y, obj) {
	togglePlayback();
};
pauseButton.down = function (x, y, obj) {
	togglePlayback();
};
bpmUpButton.down = function (x, y, obj) {
	changeBPM(5);
	tween(bpmUpButton, {
		scaleX: 1.2,
		scaleY: 1.2
	}, {
		duration: 100
	});
	tween(bpmUpButton, {
		scaleX: 1,
		scaleY: 1
	}, {
		duration: 100
	});
};
bpmDownButton.down = function (x, y, obj) {
	changeBPM(-5);
	tween(bpmDownButton, {
		scaleX: 1.2,
		scaleY: 1.2
	}, {
		duration: 100
	});
	tween(bpmDownButton, {
		scaleX: 1,
		scaleY: 1
	}, {
		duration: 100
	});
};
// Load saved pattern - handle flattened storage structure
var savedPattern = storage.pattern || {};
for (var trackIndex = 0; trackIndex < tracks.length; trackIndex++) {
	for (var stepIndex = 0; stepIndex < 12; stepIndex++) {
		var key = trackIndex + '_' + stepIndex;
		if (savedPattern[key]) {
			tracks[trackIndex].cells[stepIndex].setActive(true);
		}
	}
}
game.update = function () {
	if (isPlaying) {
		var currentTime = Date.now();
		if (currentTime - lastStepTime >= stepDuration) {
			// Play current step
			for (var i = 0; i < tracks.length; i++) {
				tracks[i].playStep(currentStep);
			}
			// Move to next step
			currentStep = (currentStep + 1) % 12;
			stepText.setText('Step: ' + (currentStep + 1) + '/12');
			// Update playhead position
			playhead.x = 150 + 32 + currentStep * 160;
			lastStepTime = currentTime;
			// Auto-save pattern - flatten to single depth for storage compatibility
			var pattern = {};
			for (var trackIndex = 0; trackIndex < tracks.length; trackIndex++) {
				for (var stepIndex = 0; stepIndex < 12; stepIndex++) {
					var key = trackIndex + '_' + stepIndex;
					pattern[key] = tracks[trackIndex].cells[stepIndex].isActive;
				}
			}
			storage.pattern = pattern;
		}
	}
};
// Title
var titleText = new Text2('BM Studio', {
	size: 80,
	fill: 0xFFFFFF
});
titleText.anchor.set(0.5, 0.5);
titleText.x = 1024;
titleText.y = 100;
game.addChild(titleText);
// Instructions
var instructText = new Text2('Tap grid to add beats • Press play to start', {
	size: 20,
	fill: 0x888888
});
instructText.anchor.set(0.5, 0);
instructText.x = 1024;
instructText.y = 2600;
game.addChild(instructText);

===================================================================
--- original.js
+++ change.js
@@ -118,9 +118,9 @@
 ****/ 
 // Initialize sound assets for each track
 var isPlaying = false;
 var currentStep = 0;
-var bpm = 120;
+var bpm = 115;
 var stepDuration = 60 / bpm / 4 * 1000;
 var lastStepTime = 0;
 var tracks = [];
 var trackData = [{