diff --git a/Core/Console.cpp b/Core/Console.cpp
index 8d1cbc6f..fb6a1c4e 100644
--- a/Core/Console.cpp
+++ b/Core/Console.cpp
@@ -473,10 +473,10 @@ void Console::ProcessCpuClock()
 
 void Console::ProcessInterferenceAudio()
 {
-	_InvA13 = _ppu->_A13pinLow;
+	_InvA13 = (_ppu->_A13pinLow == 1) ? 0 : 1; // invert relative to 2A03
 
 	_controlManager->GetInvOE1(_controlManager->_address);
-	_InvOE1 = _controlManager->_OE1pinLow;
+	_InvOE1 = (_controlManager->_OE1pinLow == 1) ? 0 : 1; // invert relative to 2A03
 
 	if (_controlManager->_strobed == true)
 		_controlManager->_strobed = false;
diff --git a/Core/SoundMixer.cpp b/Core/SoundMixer.cpp
index be8c9b17..7446f193 100644
--- a/Core/SoundMixer.cpp
+++ b/Core/SoundMixer.cpp
@@ -277,8 +277,8 @@ int16_t SoundMixer::GetOutputVolume(bool forRightChannel)
 #endif
 		GetChannelOutput(AudioChannel::EPSM_L, forRightChannel) * 4 +
 		GetChannelOutput(AudioChannel::EPSM_R, forRightChannel) * 4 +
-		GetChannelOutput(AudioChannel::InvA13, forRightChannel) * 500 +
-		GetChannelOutput(AudioChannel::InvOE1, forRightChannel) * 500
+		GetChannelOutput(AudioChannel::InvA13, forRightChannel) * 20 +
+		GetChannelOutput(AudioChannel::InvOE1, forRightChannel) * 1000
 	);
 }