From c258c507583b870b8a7ab84087d2da360b589686 Mon Sep 17 00:00:00 2001
From: Eknous-P <ehovakimyan053@gmail.com>
Date: Tue, 25 Nov 2025 12:54:02 +0400
Subject: [PATCH] fix piano keys sometimes turning black

---
 src/gui/pattern.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gui/pattern.cpp b/src/gui/pattern.cpp
index 53fb0338e..cb1bc5f1e 100644
--- a/src/gui/pattern.cpp
+++ b/src/gui/pattern.cpp
@@ -696,6 +696,7 @@ void FurnaceGUI::drawPattern() {
           }
         } else if (settings.channelFeedbackStyle==4 && e->isRunning()) {
           float amount=powf(chanOscVol[i],settings.channelFeedbackGamma);
+          if (isnan(amount)) amount=0; // how is it nan tho??
           if (e->getChanState(i)->keyOff) amount=0.0f;
           keyHit[i]=amount*0.2f;
           if (!muted && e->getChanState(i)->keyOn) {