sorry for the missing file

.gitattributes

@@ -5929,6 +5929,7 @@ src/mess/audio/gb.c svneol=native#text/plain
 src/mess/audio/gb.h svneol=native#text/plain
 src/mess/audio/gmaster.c svneol=native#text/plain
 src/mess/audio/lynx.c svneol=native#text/plain
+src/mess/audio/lynx.h svneol=native#text/plain
 src/mess/audio/mac.c svneol=native#text/plain
 src/mess/audio/mea8000.c svneol=native#text/plain
 src/mess/audio/mea8000.h svneol=native#text/plain

src/mess/audio/lynx.h

@@ -0,0 +1,87 @@
+#ifndef __LYNXSOUND_H__
+#define __LYNXSOUND_H__
+
+struct LYNX_AUDIO {
+	struct {
+		INT8 volume;
+		UINT8 feedback;
+		INT8 output;
+		UINT8 shifter;
+		UINT8 bakup;
+		UINT8 control1;
+		UINT8 counter;
+		UINT8 control2;
+	} reg;
+	UINT8 attenuation;
+	UINT16 mask; // 12-bit
+	UINT16 shifter; // 12-bit
+	float ticks;
+	int count;
+};
+
+typedef device_delegate<void (void)> lynx_sound_timer_delegate;
+
+
+class lynx_sound_device : public device_t,
+									public device_sound_interface
+{
+public:
+	lynx_sound_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source);
+	lynx_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+	DECLARE_READ8_MEMBER(read);
+	DECLARE_WRITE8_MEMBER(write);
+	void count_down(int nr);
+	static void set_timer_delegate(device_t &device, lynx_sound_timer_delegate cb);
+
+protected:
+	// device-level overrides
+	virtual void device_config_complete();
+	virtual void device_start();
+
+	virtual void device_reset();
+
+	// sound stream update overrides
+	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
+
+	void reset_channel(LYNX_AUDIO *channel);
+	void shift(int chan_nr);
+	void execute(int chan_nr);
+	void init();
+	void register_save();
+
+	sound_stream *m_mixer_channel;
+	lynx_sound_timer_delegate   m_timer_delegate;   // this calls lynx_timer_count_down from the driver state
+
+	float m_usec_per_sample;
+	int *m_shift_mask;
+	int *m_shift_xor;
+	UINT8 m_attenuation_enable;
+	UINT8 m_master_enable;
+	LYNX_AUDIO m_audio[4];
+};
+
+
+class lynx2_sound_device : public lynx_sound_device
+{
+public:
+	lynx2_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+	
+protected:
+	// device-level overrides
+	virtual void device_start();
+	
+	// sound stream update overrides
+	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
+};
+
+
+extern const device_type LYNX_SND;
+extern const device_type LYNX2_SND;
+
+
+#define MCFG_LYNX_SND_SET_TIMER( _class, _method) \
+	lynx_sound_device::set_timer_delegate(*device, lynx_sound_timer_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0));
+
+
+#endif