From 2f6c2d63c33675d475f26a3d01ccb231dc20637a Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Fri, 2 May 2025 14:39:34 -0500
Subject: [PATCH] OPL3: fix 4-op mode ignoring ins change

issue #2457
---
 src/engine/platform/opl.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index fd813bb38..79088cb0e 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -1763,7 +1763,7 @@ void DivPlatformOPL::commitState(int ch, DivInstrument* ins) {
 int DivPlatformOPL::dispatch(DivCommand c) {
   if (c.chan>=totalChans && c.chan!=adpcmChan) return 0;
   // ineffective in 4-op mode
-  if (oplType==3 && c.chan!=adpcmChan && c.chan<14 && (c.chan&1) && c.cmd!=DIV_CMD_GET_VOLMAX) {
+  if (oplType==3 && c.chan!=adpcmChan && c.chan<14 && (c.chan&1) && c.cmd!=DIV_CMD_GET_VOLMAX && c.cmd!=DIV_CMD_INSTRUMENT) {
     if (chan[c.chan-1].fourOp) return 0;
   }
   switch (c.cmd) {