From cba438560749e1f6c1bd54f3a50d13b9efda7c93 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 17 Jan 2022 18:05:29 -0500
Subject: [PATCH] ignore speed change if speed is 0

fixes #9
---
 src/engine/playback.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index bb2f5c31..ec410d65 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -460,10 +460,10 @@ void DivEngine::processRow(int i, bool afterDelay) {
     // per-system effect
     if (!perSystemEffect(i,effect,effectVal)) switch (effect) {
       case 0x09: // speed 1
-        speed1=effectVal;
+        if (effectVal>0) speed1=effectVal;
         break;
       case 0x0f: // speed 2
-        speed2=effectVal;
+        if (effectVal>0) speed2=effectVal;
         break;
       case 0x0b: // change order
         if (changeOrd<0) {