diff --git a/CMakeLists.txt b/CMakeLists.txt
index be58d284..c2bf284e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ if(DEFINED ENV{VCPKG_ROOT} AND NOT DEFINED CMAKE_TOOLCHAIN_FILE)
 endif()
 
 
-project ("sdl2-hyper-sonic-drivers" VERSION 0.15.4 DESCRIPTION "SDL2 based Hyper-Sonic Drivers for emulating old soundcards")
+project ("sdl2-hyper-sonic-drivers" VERSION 0.16.0 DESCRIPTION "SDL2 based Hyper-Sonic Drivers for emulating old soundcards")
 include (TestBigEndian)
 TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
 if(IS_BIG_ENDIAN)
diff --git a/sdl2-hyper-sonic-drivers/examples/pcm-example.cpp b/sdl2-hyper-sonic-drivers/examples/pcm-example.cpp
index d640781e..4ec2058c 100644
--- a/sdl2-hyper-sonic-drivers/examples/pcm-example.cpp
+++ b/sdl2-hyper-sonic-drivers/examples/pcm-example.cpp
@@ -62,7 +62,7 @@ int main(int argc, char* argv[])
     for (int i = 0, sig = +1; i < 3; i++, sig *= -1)
     {
         cout << i << ". playing same sound again reversed balance" << endl;
-        delayMillis(200);
+        delayMillis(500);
         drv.play(wavSound, 150, 127 * sig);
         drv.play(vocSound, 255, -127 * sig);
     }
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.cpp
index b8cb70fe..123043ce 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.cpp
@@ -8,7 +8,7 @@ namespace HyperSonicDrivers::audio
     IMixer::IMixer(const uint8_t max_channels,
         const uint32_t freq, const uint16_t buffer_size) :
         max_channels(max_channels),
-        m_sampleRate(freq), m_samples(buffer_size)
+        freq(freq), buffer_size(buffer_size)
     {
     }
 
@@ -20,5 +20,17 @@ namespace HyperSonicDrivers::audio
     void IMixer::setChannelGroupVolume(const mixer::eChannelGroup group, const uint8_t volume) noexcept
     {
         m_group_settings.at(group2i(group)).volume = volume;
+        updateChannelsVolumePan_();
+    }
+
+    int8_t IMixer::getChannelGroupPan(const mixer::eChannelGroup group) const noexcept
+    {
+        return m_group_settings.at(group2i(group)).pan;
+    }
+
+    void IMixer::setChannelGroupPan(const mixer::eChannelGroup group, const int8_t pan) noexcept
+    {
+        m_group_settings[group2i(group)].pan = pan;
+        updateChannelsVolumePan_();
     }
 }
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.hpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.hpp
index 5ce9de82..4f1988b0 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.hpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/IMixer.hpp
@@ -16,6 +16,11 @@ namespace HyperSonicDrivers::audio
     class IMixer
     {
     public:
+        const uint8_t max_channels;
+        const uint32_t freq;
+        const uint16_t buffer_size;
+        const uint8_t bitsDepth = 16; // forced to be 16-bits for now
+
         IMixer(IMixer&) = delete;
         IMixer& operator=(IMixer&) = delete;
 
@@ -40,6 +45,7 @@ namespace HyperSonicDrivers::audio
 
         virtual void reset() noexcept = 0;
         virtual void reset(const uint8_t id) noexcept = 0;
+        virtual void reset(const mixer::eChannelGroup group) noexcept = 0;
 
         virtual void pause() noexcept = 0;
         virtual void pause(const uint8_t id) noexcept = 0;
@@ -47,9 +53,12 @@ namespace HyperSonicDrivers::audio
         virtual void unpause() noexcept = 0;
         virtual void unpause(const uint8_t id) noexcept = 0;
 
-        virtual bool isChannelActive(const uint8_t id) const noexcept = 0;
+        virtual bool isActive(const uint8_t id) const noexcept = 0;
         virtual bool isPaused(const uint8_t id) const noexcept = 0;
 
+        virtual bool isActive() const noexcept = 0;
+        virtual bool isActive(const mixer::eChannelGroup group) = 0;
+
         virtual bool isChannelGroupMuted(const mixer::eChannelGroup group) const noexcept = 0;
         virtual void muteChannelGroup(const mixer::eChannelGroup group) noexcept = 0;
         virtual void unmuteChannelGroup(const mixer::eChannelGroup group) noexcept = 0;
@@ -66,27 +75,24 @@ namespace HyperSonicDrivers::audio
         uint8_t getChannelGroupVolume(const mixer::eChannelGroup group) const noexcept;
         void setChannelGroupVolume(const mixer::eChannelGroup group, const uint8_t volume) noexcept;
 
-        // TODO: these 3 methods are useless if those 3 vars are consts...
-        inline uint32_t getOutputRate() const noexcept { return m_sampleRate; };
-        inline uint16_t getBufferSize() const noexcept { return m_samples; };
-        inline uint8_t getBitsDepth() const noexcept { return m_bitsDepth; };
-        inline uint8_t getMasterVolume() const noexcept { return m_master_volume; };
+        int8_t getChannelGroupPan(const mixer::eChannelGroup group) const noexcept;
+        void setChannelGroupPan(const mixer::eChannelGroup group, const int8_t pan) noexcept;
 
+        inline uint8_t getMasterVolume() const noexcept { return m_master_volume; };
         virtual void setMasterVolume(const uint8_t master_volume) noexcept = 0;
 
         inline void toggleReverseStereo() noexcept { m_reverseStereo = !m_reverseStereo; };
 
-        const uint8_t max_channels;
     protected:
+        virtual void updateChannelsVolumePan_() noexcept = 0;
+
         std::array<mixer::channelGroupSettings_t, mixer::eChannelGroup_size> m_group_settings;
         bool m_ready = false; // TODO: not really useful if not used anywhere else except init.
                               //       unless remove init method and do it in the constructor
                               //       and then check if it is ready before use the mixer
                               //       otherwise can just be removed.
         bool m_reverseStereo = false;
-        const uint32_t m_sampleRate;
-        const uint16_t m_samples;
-        const uint8_t m_bitsDepth = 16; // forced to be 16-bits for now
+        
         uint8_t m_master_volume = mixer::Mixer_max_volume;
     };
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/CopyRateConverter.hpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/CopyRateConverter.hpp
index 2a87bf3f..8d5af722 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/CopyRateConverter.hpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/CopyRateConverter.hpp
@@ -47,9 +47,9 @@ namespace HyperSonicDrivers::audio::converters
                 int16_t out1 = (stereo ? *it++ : out0);
 
                 // output left channel
-                output_channel(obuf[reverseStereo ? 0 : 1], out0, vol_l);
+                output_channel(obuf[reverseStereo ? 1 : 0], out0, vol_l);
                 // output right channel
-                output_channel(obuf[reverseStereo ? 1 : 0], out1, vol_r);
+                output_channel(obuf[reverseStereo ? 0 : 1], out1, vol_r);
                 obuf += 2;
             }
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/LinearRateConverter.hpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/LinearRateConverter.hpp
index 7ea2bac9..52f56d7f 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/LinearRateConverter.hpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/LinearRateConverter.hpp
@@ -117,9 +117,9 @@ namespace HyperSonicDrivers::audio::converters
                 const int16_t out0 = interpolate(ilast0, icur0, opos);
                 const int16_t out1 = stereo ? interpolate(ilast1, icur1, opos) : out0;
                 // output left channel
-                output_channel(obuf[reverseStereo ? 0 : 1], out0, vol_l);
+                output_channel(obuf[reverseStereo ? 1 : 0], out0, vol_l);
                 // output right channel
-                output_channel(obuf[reverseStereo ? 1 : 0], out1, vol_r);
+                output_channel(obuf[reverseStereo ? 0 : 1], out1, vol_r);
                 obuf += 2;
 
                 // Increment output position
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/SimpleRateConverter.hpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/SimpleRateConverter.hpp
index 4530f9a1..6b54fc32 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/SimpleRateConverter.hpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/converters/SimpleRateConverter.hpp
@@ -95,9 +95,9 @@ namespace HyperSonicDrivers::audio::converters
             opos += opos_inc;
 
             // output left channel
-            output_channel(obuf[reverseStereo ? 0 : 1], out0, vol_l);
+            output_channel(obuf[reverseStereo ? 1 : 0], out0, vol_l);
             // output right channel
-            output_channel(obuf[reverseStereo ? 1 : 0], out1, vol_r);
+            output_channel(obuf[reverseStereo ? 0 : 1], out1, vol_r);
             obuf += 2;
         }
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/mixer/Channel.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/mixer/Channel.cpp
index 814a9fb0..d61ea116 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/mixer/Channel.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/mixer/Channel.cpp
@@ -17,7 +17,7 @@ namespace HyperSonicDrivers::audio::mixer
         reset();
         m_group = group;
         m_stream = stream;
-        m_converter = converters::makeIRateConverter(m_stream->getRate(), m_mixer.getOutputRate(), m_stream->isStereo(), reverseStereo);
+        m_converter = converters::makeIRateConverter(m_stream->getRate(), m_mixer.freq, m_stream->isStereo(), reverseStereo);
     }
 
     void Channel::setAudioStream(const mixer::eChannelGroup group, const std::shared_ptr<IAudioStream>& stream,
@@ -118,8 +118,8 @@ namespace HyperSonicDrivers::audio::mixer
         const float pan = (127.5f + m_pan) / 255.0f;
         // TODO: create different selectable pan laws
         // -3dB pan law
-        m_volL = static_cast<uint16_t>(std::round(sqrt(pan) * vol / ch_max_vol));
-        m_volR = static_cast<uint16_t>(std::round(sqrt(1 - pan) * vol / ch_max_vol));
+        m_volL = static_cast<uint16_t>(std::round(sqrt(1 - pan) * vol / ch_max_vol));
+        m_volR = static_cast<uint16_t>(std::round(sqrt(pan) * vol / ch_max_vol));
 
         // adjust for master volume
         const auto m_vol = m_mixer.getMasterVolume();
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.cpp
index c7c1515f..22a52037 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.cpp
@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <ranges>
 #include <cstring>
 #include <cassert>
 #include <HyperSonicDrivers/audio/sdl2/Mixer.hpp>
@@ -86,6 +87,17 @@ namespace HyperSonicDrivers::audio::sdl2
         m_channels[id]->reset();
     }
 
+    void Mixer::reset(const mixer::eChannelGroup group) noexcept
+    {
+        std::scoped_lock lck(m_mutex);
+
+        for (const auto& ch : m_channels)
+        {
+            if (ch->getChannelGroup() == group)
+                ch->reset();
+        }
+    }
+
     void Mixer::pause() noexcept
     {
         std::scoped_lock lck(m_mutex);
@@ -116,7 +128,7 @@ namespace HyperSonicDrivers::audio::sdl2
         m_channels[id]->unpause();
     }
 
-    bool Mixer::isChannelActive(const uint8_t id) const noexcept
+    bool Mixer::isActive(const uint8_t id) const noexcept
     {
         std::scoped_lock lck(m_mutex);
 
@@ -130,6 +142,24 @@ namespace HyperSonicDrivers::audio::sdl2
         return m_channels[id]->isPaused();
     }
 
+    bool Mixer::isActive() const noexcept
+    {
+        std::scoped_lock lck(m_mutex);
+
+        return std::ranges::any_of(m_channels, [](const auto& ch)
+            { return !ch->isEnded(); });
+    }
+
+    bool Mixer::isActive(const mixer::eChannelGroup group)
+    {
+        std::scoped_lock lck(m_mutex);
+
+        return std::ranges::any_of(m_channels, [group](const auto& ch)
+            { return ch->getChannelGroup() == group && !ch->isEnded(); });
+
+        return false;
+    }
+
     bool Mixer::isChannelGroupMuted(const mixer::eChannelGroup group) const noexcept
     {
         return m_group_settings[group2i(group)].mute;
@@ -195,6 +225,12 @@ namespace HyperSonicDrivers::audio::sdl2
         updateChannelsVolumePan_();
     }
 
+    void Mixer::updateChannelsVolumePan_() noexcept
+    {
+        for (const auto& ch : m_channels)
+            ch->updateVolumePan();
+    }
+
     bool Mixer::init_(SDL_AudioCallback callback, void* userdata)
     {
         m_ready = false;
@@ -206,10 +242,10 @@ namespace HyperSonicDrivers::audio::sdl2
 
         // Get the desired audio specs
         SDL_AudioSpec desired = {
-            .freq = static_cast<int>(m_sampleRate),
+            .freq = static_cast<int>(freq),
             .format = AUDIO_S16,
             .channels = 2,
-            .samples = m_samples,
+            .samples = buffer_size,
             .callback = callback,
             .userdata = userdata
         };
@@ -244,12 +280,6 @@ namespace HyperSonicDrivers::audio::sdl2
         return true;
     }
 
-    void Mixer::updateChannelsVolumePan_() noexcept
-    {
-        for (const auto& ch : m_channels)
-            ch->updateVolumePan();
-    }
-
     size_t Mixer::callback(uint8_t* samples, unsigned int len)
     {
         const std::scoped_lock lck(m_mutex);
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.hpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.hpp
index 899c8968..e8693568 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.hpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Mixer.hpp
@@ -32,6 +32,7 @@ namespace HyperSonicDrivers::audio::sdl2
 
         void reset() noexcept override;
         void reset(const uint8_t id) noexcept override;
+        void reset(const mixer::eChannelGroup group) noexcept override;
 
         void pause() noexcept override;
         void pause(const uint8_t id) noexcept override;
@@ -39,9 +40,11 @@ namespace HyperSonicDrivers::audio::sdl2
         void unpause() noexcept override;
         void unpause(const uint8_t id) noexcept override;
 
-        bool isChannelActive(const uint8_t id) const noexcept override;
+        bool isActive(const uint8_t id) const noexcept override;
         bool isPaused(const uint8_t id) const noexcept override;
 
+        bool isActive() const noexcept override;
+        bool isActive(const mixer::eChannelGroup group) override;
 
         bool isChannelGroupMuted(const mixer::eChannelGroup group) const noexcept override;;
         void muteChannelGroup(const mixer::eChannelGroup group) noexcept override;
@@ -58,9 +61,11 @@ namespace HyperSonicDrivers::audio::sdl2
 
         void setMasterVolume(const uint8_t master_volume) noexcept override;
 
+    protected:
+        void updateChannelsVolumePan_() noexcept override;
+
     private:
         bool init_(SDL_AudioCallback callback, void* userdata);
-        void updateChannelsVolumePan_() noexcept;
 
         size_t callback(uint8_t* samples, unsigned int len);
         static void sdlCallback(void* this_, uint8_t* samples, int len);
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Renderer.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Renderer.cpp
index f79ee2f2..4150a374 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Renderer.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/audio/sdl2/Renderer.cpp
@@ -26,7 +26,7 @@ namespace HyperSonicDrivers::audio::sdl2
         if (m_buf.empty())
         {
             m_out->save_prepare(stream->getRate(), stream->isStereo());
-            m_buf.resize(m_mixer->getBufferSize());
+            m_buf.resize(m_mixer->buffer_size);
         }
 
         const size_t read = stream->readBuffer(m_buf.data(), m_buf.size());
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/IHardware.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/IHardware.cpp
index d8145918..1533a8c8 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/IHardware.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/IHardware.cpp
@@ -6,12 +6,14 @@
 namespace HyperSonicDrivers::hardware
 {
     IHardware::IHardware(const std::shared_ptr<audio::IMixer>& mixer) :
-        m_mixer(mixer), m_output_rate(m_mixer->getOutputRate())
+        m_mixer(mixer)
     {
         if (m_mixer == nullptr)
         {
             utils::throwLogC<std::runtime_error>("mixer is null");
         }
+
+        m_output_rate = m_mixer->freq;
     }
 
     IHardware::~IHardware()
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/mt32/MT32.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/mt32/MT32.cpp
index 28597f6f..8586828d 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/mt32/MT32.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/mt32/MT32.cpp
@@ -131,7 +131,7 @@ namespace HyperSonicDrivers::hardware::mt32
         setAudioStream(std::make_shared<audio::streams::EmulatedStream>(
             this,
             isStereo(),
-            m_mixer->getOutputRate(),
+            m_mixer->freq,
             setCallbackFrequency(timerFrequency)
         ));
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/OPL.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/OPL.cpp
index c6f324d3..2235e256 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/OPL.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/OPL.cpp
@@ -33,7 +33,7 @@ namespace HyperSonicDrivers::hardware::opl
         setAudioStream(std::make_shared<audio::streams::EmulatedStream>(
             this,
             isStereo(),
-            m_mixer->getOutputRate(),
+            m_mixer->freq,
             setCallbackFrequency(timerFrequency)
         ));
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/mame/MameOPL3.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/mame/MameOPL3.cpp
index cba69114..7dace502 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/mame/MameOPL3.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/mame/MameOPL3.cpp
@@ -38,9 +38,9 @@ namespace HyperSonicDrivers::hardware::opl::mame
         _opl = new ymfm::ymf262(_ymfm);
 
         auto rate = _opl->sample_rate(OPL3_INTERNAL_FREQ);
-        _opl->sample_rate(m_mixer->getOutputRate());
+        _opl->sample_rate(m_mixer->freq);
 
-        _chip = ymf262_init(0, OPL3_INTERNAL_FREQ, m_mixer->getOutputRate());
+        _chip = ymf262_init(0, OPL3_INTERNAL_FREQ, m_mixer->freq);
         //_init = _opl != nullptr;
         m_init = _chip != nullptr;
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/dosbox/DosBoxOPL.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/dosbox/DosBoxOPL.cpp
index 63214fbe..a618d638 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/dosbox/DosBoxOPL.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/dosbox/DosBoxOPL.cpp
@@ -36,7 +36,7 @@ namespace HyperSonicDrivers::hardware::opl::scummvm::dosbox
             return false;
 
         dbopl::InitTables();
-        m_rate = m_mixer->getOutputRate();
+        m_rate = m_mixer->freq;
         m_emulator->Setup(m_rate);
 
         if (type == OplType::DUAL_OPL2) {
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/mame/MameOPL2.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/mame/MameOPL2.cpp
index 03fb7051..166e7c05 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/mame/MameOPL2.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/mame/MameOPL2.cpp
@@ -26,7 +26,7 @@ namespace HyperSonicDrivers::hardware::opl::scummvm::mame
         if (m_init)
             return true;
 
-        _opl = makeAdLibOPL(m_mixer->getOutputRate());
+        _opl = makeAdLibOPL(m_mixer->freq);
         memset(&_reg, 0, sizeof(_reg));
         m_init = (_opl != nullptr);
 
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/nuked/NukedOPL3.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/nuked/NukedOPL3.cpp
index 0ac69974..7b003298 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/nuked/NukedOPL3.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/scummvm/nuked/NukedOPL3.cpp
@@ -17,7 +17,7 @@ namespace HyperSonicDrivers::hardware::opl::scummvm::nuked
             return true;
 
         memset(&_reg, 0, sizeof(_reg));
-        _rate = m_mixer->getOutputRate();
+        _rate = m_mixer->freq;
         OPL3_Reset(chip.get(), _rate);
 
         if (type == OplType::DUAL_OPL2) {
diff --git a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/woody/WoodyOPL.cpp b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/woody/WoodyOPL.cpp
index c69d1465..aa21e45b 100644
--- a/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/woody/WoodyOPL.cpp
+++ b/sdl2-hyper-sonic-drivers/src/HyperSonicDrivers/hardware/opl/woody/WoodyOPL.cpp
@@ -20,9 +20,9 @@ namespace HyperSonicDrivers::hardware
 
                 stop();
                 if (type == OplType::DUAL_OPL2)
-                    _opl =std::make_unique<SurroundOPL>(m_mixer->getOutputRate());
+                    _opl =std::make_unique<SurroundOPL>(m_mixer->freq);
                 else
-                    _opl = std::make_unique<WoodyEmuOPL>(m_mixer->getOutputRate());
+                    _opl = std::make_unique<WoodyEmuOPL>(m_mixer->freq);
 
                 m_init = _opl != nullptr;
 
diff --git a/sdl2-hyper-sonic-drivers/test/HyperSonicDrivers/audio/IMixerMock.hpp b/sdl2-hyper-sonic-drivers/test/HyperSonicDrivers/audio/IMixerMock.hpp
index d115b853..25f13482 100644
--- a/sdl2-hyper-sonic-drivers/test/HyperSonicDrivers/audio/IMixerMock.hpp
+++ b/sdl2-hyper-sonic-drivers/test/HyperSonicDrivers/audio/IMixerMock.hpp
@@ -33,6 +33,7 @@ namespace HyperSonicDrivers::audio
 
         void reset() noexcept override {};
         void reset(const uint8_t id) noexcept override {};
+        void reset(const mixer::eChannelGroup group) noexcept override {};
 
         void pause() noexcept override {};
         void pause(const uint8_t id) noexcept override {};
@@ -40,8 +41,10 @@ namespace HyperSonicDrivers::audio
         void unpause() noexcept override {};
         void unpause(const uint8_t id) noexcept override {};
 
-        bool isChannelActive(const uint8_t id) const noexcept override { return true; };
+        bool isActive(const uint8_t id) const noexcept override { return true; };
         bool isPaused(const uint8_t id) const noexcept override { return false; }
+        bool isActive() const noexcept override { return true; };
+        bool isActive(const mixer::eChannelGroup group) override { return true; };
         bool isChannelGroupMuted(const mixer::eChannelGroup group) const noexcept override { return false; };
         void muteChannelGroup(const mixer::eChannelGroup group) noexcept override {};
         void unmuteChannelGroup(const mixer::eChannelGroup group) noexcept override {};
@@ -56,5 +59,7 @@ namespace HyperSonicDrivers::audio
         void setChannelVolumePan(const uint8_t id, const uint8_t volume, const int8_t pan) noexcept override {};
 
         void setMasterVolume(const uint8_t master_volume) noexcept override {};
+
+        void updateChannelsVolumePan_() noexcept override {};
     };
 }