Vocal fixes

Assets/Script/PlayMode/MicPlayer.cs

@@ -210,7 +210,11 @@ private void Start() {
 				// Spawn needle
 				var needle = Instantiate(needlePrefab, transform).GetComponent<VocalNeedle>();
 				needle.transform.localPosition = needlePrefab.transform.position;
-				needle.ParticleSpeed = trackSpeed;
+				needle.SetLineProperties(
+					4f / trackSpeed,
+					trackSpeed,
+					trackSpeed / 4f * 50.0f
+				);
 
 				// Create player info
 				var playerInfo = new PlayerInfo {
@@ -871,14 +875,16 @@ private void CalculateSectionSingTime(float start) {
 		}
 
 		private float GetSingTimeMultiplier(Difficulty diff) {
-			return diff switch {
+			float multiplier = diff switch {
 				Difficulty.EASY => 0.45f,
 				Difficulty.MEDIUM => 0.5f,
 				Difficulty.HARD => 0.55f,
 				Difficulty.EXPERT => 0.6f,
 				Difficulty.EXPERT_PLUS => 0.7f,
 				_ => throw new Exception("Unreachable.")
 			};
+
+			return multiplier / Play.speed;
 		}
 
 		private float CalcLagCompensation(float currentTime, float noteTime) {

Assets/Script/PlayMode/VocalNeedle.cs

@@ -11,18 +11,16 @@ public class VocalNeedle : MonoBehaviour {
 		[SerializeField]
 		private Texture2D[] needleTextures;
 
-		private float _particleSpeed;
-		public float ParticleSpeed {
-			get {
-				return _particleSpeed;
-			}
-			set {
-				_particleSpeed = value;
-				activeParticles.SetStartSpeed(value);
-				nonActiveParticles.SetStartSpeed(value);
-			}
+		public void SetLineProperties(float lifetime, float startSpeed, float emissionRate) {
+			activeParticles.SetStartLifetime(lifetime);
+			activeParticles.SetStartSpeed(startSpeed);
+			activeParticles.SetEmissionRate(emissionRate);
+			nonActiveParticles.SetStartLifetime(lifetime);
+			nonActiveParticles.SetStartSpeed(startSpeed);
+			nonActiveParticles.SetEmissionRate(emissionRate);
 		}
 
+
 		private void Start() {
 			// Give random needle (for now)
 			meshRenderer.material.mainTexture = needleTextures[Random.Range(0, needleTextures.Length)];

Assets/Script/Util/ParticleGroup.cs

@@ -67,6 +67,20 @@ public void SetStartSpeed(float speed) {
 			}
 		}
 
+		public void SetStartLifetime(float lifetime) {
+			foreach (var particle in particles) {
+				var main = particle.main;
+				main.startLifetime = lifetime;
+			}
+		}
+
+		public void SetEmissionRate(float rate) {
+			foreach (var particle in particles) {
+				var e = particle.emission;
+				e.rateOverTime = rate;
+			}
+		}
+
 		public void Play(float speed = 4.0f) {
 			foreach (var particle in particles) {
 				if (particle.main.loop && particle.isEmitting) {