From 9f2cb1450fcba1bddfc0a2fede93d6acdc6da222 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Thu, 29 Sep 2022 00:10:34 -0500
Subject: [PATCH] YM2151: fix LFO

---
 src/engine/platform/arcade.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/engine/platform/arcade.cpp b/src/engine/platform/arcade.cpp
index 477430994..aaf64e074 100644
--- a/src/engine/platform/arcade.cpp
+++ b/src/engine/platform/arcade.cpp
@@ -218,6 +218,10 @@ void DivPlatformArcade::tick(bool sysTick) {
       immWrite(0x18,chan[i].std.ex3.val);
     }
 
+    if (chan[i].std.ex1.had || chan[i].std.ex2.had || chan[i].std.ex3.had) {
+      immWrite(0x01,0x00); // LFO On
+    }
+
     if (chan[i].std.alg.had) {
       chan[i].state.alg=chan[i].std.alg.val;
       if (isMuted[i]) {