diff --git a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es5506.cpp b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es5506.cpp
index 17ba705a..1bf78189 100644
--- a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es5506.cpp
+++ b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es5506.cpp
@@ -55,7 +55,6 @@ void es5506_core::voice_tick()
 	// Voice updates every 2 E clock cycle (or 4 BCLK clock cycle)
   // Update voice
   for (int i=0; i<VGS_CLAMP(m_active,4,31); i++) {
-    m_voice[i].fetch(0);
     m_voice[i].tick(i);
   }
 
@@ -105,10 +104,11 @@ void es5506_core::voice_t::tick(u8 voice)
 	m_ch.reset();
 
 	// Filter execute
-	m_filter.tick(m_alu.interpolation());
 
 	if (m_alu.busy())
 	{
+                fetch(0);
+         	m_filter.tick(m_alu.interpolation());
 		// Send to output
 		m_output[0] = m_mute ? 0 : volume_calc(m_lvol, (short)m_filter.o4_1());
 		m_output[1] = m_mute ? 0 : volume_calc(m_rvol, (short)m_filter.o4_1());
@@ -121,7 +121,9 @@ void es5506_core::voice_t::tick(u8 voice)
 		{
 			m_alu.loop_exec();
 		}
-	}
+	} else {
+         	m_filter.tick(m_alu.interpolation());
+        }
 	// Envelope
 	if (m_ecount != 0)
 	{
diff --git a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x.hpp b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x.hpp
index 16836da9..75f45a3b 100644
--- a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x.hpp
+++ b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x.hpp
@@ -347,7 +347,7 @@ class es550x_shared_core : public vgsound_emu_core
 
 								inline u8 loop() { return (m_lpe << 0) | (m_ble << 1); }
 
-							private:
+							public:
 								u8 m_stop0 : 1;	 // Stop with ALU
 								u8 m_stop1 : 1;	 // Stop with processor
 								u8 m_lpe   : 1;	 // Loop enable
@@ -429,8 +429,8 @@ class es550x_shared_core : public vgsound_emu_core
 						inline s32 o4_1() { return m_o[4][0]; }
 
 					private:
-						void lp_exec(s32 coeff, s32 in, s32 out);
-						void hp_exec(s32 coeff, s32 in, s32 out);
+						void lp_exec(s32 coeff, const s32 in, const s32 out);
+						void hp_exec(s32 coeff, const s32 in, const s32 out);
 
 						// Registers
 						u8 m_lp = 0;  // Filter mode
diff --git a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_alu.cpp b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_alu.cpp
index 103a7ff0..c78c9472 100644
--- a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_alu.cpp
+++ b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_alu.cpp
@@ -33,19 +33,19 @@ bool es550x_shared_core::es550x_voice_t::es550x_alu_t::tick()
 	}
 
 	m_accum &= m_accum_mask;
-	return ((!m_cr.lei()) &&
-			(((m_cr.dir()) && (m_accum < m_start)) || ((!m_cr.dir()) && (m_accum > m_end))))
+	return ((!m_cr.m_lei) &&
+			(((m_cr.m_dir) && (m_accum < m_start)) || ((!m_cr.m_dir) && (m_accum > m_end))))
 		   ? true
 		   : false;
 }
 
 void es550x_shared_core::es550x_voice_t::es550x_alu_t::loop_exec()
 {
-	if (m_cr.dir())	 // Reverse playback
+	if (m_cr.m_dir)	 // Reverse playback
 	{
-		if (m_cr.lpe())	 // Loop enable
+		if (m_cr.m_lpe)	 // Loop enable
 		{
-			if (m_cr.ble())	 // Bidirectional
+			if (m_cr.m_ble)	 // Bidirectional
 			{
 				m_cr.set_dir(false);
 				m_accum = m_start + (m_start - m_accum);
@@ -55,7 +55,7 @@ void es550x_shared_core::es550x_voice_t::es550x_alu_t::loop_exec()
 				m_accum = m_end - (m_start - m_accum);
 			}
 		}
-		else if (m_cr.ble() && m_transwave)	 // m_transwave
+		else if (m_cr.m_ble && m_transwave)	 // m_transwave
 		{
 			m_cr.set_loop(0);
 			m_cr.set_lei(true);	 // Loop end ignore
@@ -68,9 +68,9 @@ void es550x_shared_core::es550x_voice_t::es550x_alu_t::loop_exec()
 	}
 	else
 	{
-		if (m_cr.lpe())	 // Loop enable
+		if (m_cr.m_lpe)	 // Loop enable
 		{
-			if (m_cr.ble())	 // Bidirectional
+			if (m_cr.m_ble)	 // Bidirectional
 			{
 				m_cr.set_dir(true);
 				m_accum = m_end - (m_end - m_accum);
@@ -80,7 +80,7 @@ void es550x_shared_core::es550x_voice_t::es550x_alu_t::loop_exec()
 				m_accum = (m_accum - m_end) + m_start;
 			}
 		}
-		else if (m_cr.ble() && m_transwave)	 // m_transwave
+		else if (m_cr.m_ble && m_transwave)	 // m_transwave
 		{
 			m_cr.set_loop(0);
 			m_cr.set_lei(true);	 // Loop end ignore
diff --git a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_filter.cpp b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_filter.cpp
index 1ba62a57..afff686d 100644
--- a/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_filter.cpp
+++ b/extern/vgsound_emu-modified/vgsound_emu/src/es550x/es550x_filter.cpp
@@ -50,7 +50,7 @@ void es550x_shared_core::es550x_voice_t::es550x_filter_t::tick(s32 in)
 	}
 }
 
-void es550x_shared_core::es550x_voice_t::es550x_filter_t::lp_exec(s32 coeff, s32 in, s32 out)
+void es550x_shared_core::es550x_voice_t::es550x_filter_t::lp_exec(s32 coeff, const s32 in, const s32 out)
 {
 	// Store previous filter data
 	m_o[out][1] = m_o[out][0];
@@ -59,7 +59,7 @@ void es550x_shared_core::es550x_voice_t::es550x_filter_t::lp_exec(s32 coeff, s32
 	m_o[out][0] = ((coeff * (m_o[in][0] - m_o[out][0])) / 4096) + m_o[out][0];
 }
 
-void es550x_shared_core::es550x_voice_t::es550x_filter_t::hp_exec(s32 coeff, s32 in, s32 out)
+void es550x_shared_core::es550x_voice_t::es550x_filter_t::hp_exec(s32 coeff, const s32 in, const s32 out)
 {
 	// Store previous filter data
 	m_o[out][1] = m_o[out][0];