From 8675cdf8029310090161fce383bf764b92704e17 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Thu, 28 Apr 2022 05:38:28 -0500
Subject: [PATCH] OPL 4-op note preview possible fix

---
 src/engine/engine.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 5abd2d53..b5b60b90 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2175,7 +2175,7 @@ void DivEngine::autoNoteOn(int ch, int ins, int note, int vol) {
 
   // 2. find a free channel
   do {
-    if (isViable[finalChan] && chan[finalChan].midiNote==-1 && getChannelType(finalChan)==finalChanType) {
+    if (isViable[finalChan] && chan[finalChan].midiNote==-1 && (insInst->type==DIV_INS_OPL || getChannelType(finalChan)==finalChanType)) {
       chan[finalChan].midiNote=note;
       chan[finalChan].midiAge=midiAgeCounter++;
       pendingNotes.push(DivNoteEvent(finalChan,ins,note,vol,true));
@@ -2189,7 +2189,7 @@ void DivEngine::autoNoteOn(int ch, int ins, int note, int vol) {
   // 3. find the oldest channel
   int candidate=finalChan;
   do {
-    if (isViable[finalChan] && getChannelType(finalChan)==finalChanType && chan[finalChan].midiAge<chan[candidate].midiAge) {
+    if (isViable[finalChan] && (insInst->type==DIV_INS_OPL || getChannelType(finalChan)==finalChanType) && chan[finalChan].midiAge<chan[candidate].midiAge) {
       candidate=finalChan;
     }
     if (++finalChan>=chans) {