diff --git b/libs/fluidsynth/fluidsynth/synth.h a/libs/fluidsynth/fluidsynth/synth.h
index 1a0046fe1..a4afb9094 100644
--- b/libs/fluidsynth/fluidsynth/synth.h
+++ a/libs/fluidsynth/fluidsynth/synth.h
@@ -265,7 +265,7 @@ FLUIDSYNTH_API int fluid_synth_write_s16(fluid_synth_t *synth, int len,
 FLUIDSYNTH_API int fluid_synth_write_float(fluid_synth_t *synth, int len,
         void *lout, int loff, int lincr,
         void *rout, int roff, int rincr);
-FLUID_DEPRECATED FLUIDSYNTH_API int fluid_synth_nwrite_float(fluid_synth_t *synth, int len,
+FLUIDSYNTH_API int fluid_synth_nwrite_float(fluid_synth_t *synth, int len,
         float **left, float **right,
         float **fx_left, float **fx_right);
 FLUIDSYNTH_API int fluid_synth_process(fluid_synth_t *synth, int len,
@@ -310,7 +310,9 @@ FLUIDSYNTH_API int fluid_synth_set_custom_filter(fluid_synth_t *, int type, int
 
 /* LADSPA */
 
+#ifdef LADSPA
 FLUIDSYNTH_API fluid_ladspa_fx_t *fluid_synth_get_ladspa_fx(fluid_synth_t *synth);
+#endif
 
 
 /* API: Poly mono mode */
diff --git b/libs/fluidsynth/fluidsynth/types.h a/libs/fluidsynth/fluidsynth/types.h
index 47ef18336..5ad29281a 100644
--- b/libs/fluidsynth/fluidsynth/types.h
+++ a/libs/fluidsynth/fluidsynth/types.h
@@ -56,7 +56,9 @@ typedef struct _fluid_sequencer_t fluid_sequencer_t;            /**< Sequencer i
 typedef struct _fluid_ramsfont_t fluid_ramsfont_t;              /**< RAM SoundFont */
 typedef struct _fluid_rampreset_t fluid_rampreset_t;            /**< RAM SoundFont preset */
 typedef struct _fluid_cmd_handler_t fluid_cmd_handler_t;        /**< Shell Command Handler */
+#ifdef LADSPA
 typedef struct _fluid_ladspa_fx_t fluid_ladspa_fx_t;            /**< LADSPA effects instance */
+#endif
 typedef struct _fluid_file_callbacks_t fluid_file_callbacks_t;  /**< Callback struct to perform custom file loading of soundfonts */
 
 typedef int fluid_istream_t;    /**< Input stream descriptor */
diff --git b/libs/fluidsynth/src/fluid_hash.c a/libs/fluidsynth/src/fluid_hash.c
index 37b0a06a4..b6586895b 100644
--- b/libs/fluidsynth/src/fluid_hash.c
+++ a/libs/fluidsynth/src/fluid_hash.c
@@ -991,6 +991,7 @@ fluid_hashtable_remove_all(fluid_hashtable_t *hashtable)
     fluid_hashtable_maybe_resize(hashtable);
 }
 
+#if 0
 /**
  * fluid_hashtable_steal_all:
  * @hashtable: a #fluid_hashtable_t.
@@ -1008,6 +1009,7 @@ fluid_hashtable_steal_all(fluid_hashtable_t *hashtable)
     fluid_hashtable_remove_all_nodes(hashtable, FALSE);
     fluid_hashtable_maybe_resize(hashtable);
 }
+#endif
 
 /*
  * fluid_hashtable_foreach_remove_or_steal:
diff --git b/libs/fluidsynth/src/fluid_midi.c a/libs/fluidsynth/src/fluid_midi.c
index c05f994ce..bdf72dd68 100644
--- b/libs/fluidsynth/src/fluid_midi.c
+++ a/libs/fluidsynth/src/fluid_midi.c
@@ -75,7 +75,7 @@ static int fluid_midi_file_read_tracklen(fluid_midi_file *mf);
 static int fluid_midi_file_eot(fluid_midi_file *mf);
 static int fluid_midi_file_get_division(fluid_midi_file *midifile);
 
-
+#if 0 // disable file I/O with Ardour
 /***************************************************************
  *
  *                      MIDIFILE
@@ -1011,6 +1011,7 @@ fluid_midi_file_get_division(fluid_midi_file *midifile)
 {
     return midifile->division;
 }
+#endif
 
 /******************************************************
  *
@@ -1330,7 +1331,7 @@ static void fluid_midi_event_set_sysex_LOCAL(fluid_midi_event_t *evt, int type,
  *
  *     fluid_track_t
  */
-
+#if 0 // disable fluid file player in Ardour
 /*
  * new_fluid_track
  */
@@ -2434,3 +2435,4 @@ fluid_midi_event_length(unsigned char event)
 
     return 1;
 }
+#endif
diff --git b/libs/fluidsynth/src/fluid_rev.c a/libs/fluidsynth/src/fluid_rev.c
index 8a58d1e85..51b4faa25 100644
--- b/libs/fluidsynth/src/fluid_rev.c
+++ a/libs/fluidsynth/src/fluid_rev.c
@@ -51,7 +51,7 @@ void fluid_allpass_init(fluid_allpass *allpass);
 void fluid_allpass_setfeedback(fluid_allpass *allpass, fluid_real_t val);
 fluid_real_t fluid_allpass_getfeedback(fluid_allpass *allpass);
 
-void
+static void
 fluid_allpass_setbuffer(fluid_allpass *allpass, int size)
 {
     allpass->bufidx = 0;
@@ -59,7 +59,7 @@ fluid_allpass_setbuffer(fluid_allpass *allpass, int size)
     allpass->bufsize = size;
 }
 
-void
+static void
 fluid_allpass_release(fluid_allpass *allpass)
 {
     FLUID_FREE(allpass->buffer);
diff --git b/libs/fluidsynth/src/fluid_rvoice_mixer.c a/libs/fluidsynth/src/fluid_rvoice_mixer.c
index 3b264e4d9..8c5254f26 100644
--- b/libs/fluidsynth/src/fluid_rvoice_mixer.c
+++ a/libs/fluidsynth/src/fluid_rvoice_mixer.c
@@ -24,11 +24,9 @@
 #include "fluid_rev.h"
 #include "fluid_chorus.h"
 #include "fluidsynth_priv.h"
-#include "fluid_ladspa.h"
 #include "fluid_synth.h"
 
-
-#define ENABLE_MIXER_THREADS 1
+#undef ENABLE_MIXER_THREADS // Ardour does the multithreading -- synth.cpu-cores defaults to 1
 
 // If less than x voices, the thread overhead is larger than the gain,
 // so don't activate the thread(s).
diff --git b/libs/fluidsynth/src/fluid_rvoice_mixer.h a/libs/fluidsynth/src/fluid_rvoice_mixer.h
index 4ee072e4b..1b3fceb34 100644
--- b/libs/fluidsynth/src/fluid_rvoice_mixer.h
+++ a/libs/fluidsynth/src/fluid_rvoice_mixer.h
@@ -24,7 +24,6 @@
 
 #include "fluidsynth_priv.h"
 #include "fluid_rvoice.h"
-#include "fluid_ladspa.h"
 
 typedef struct _fluid_rvoice_mixer_t fluid_rvoice_mixer_t;
 
diff --git b/libs/fluidsynth/src/fluid_settings.c a/libs/fluidsynth/src/fluid_settings.c
index d77d5ed79..05423384e 100644
--- b/libs/fluidsynth/src/fluid_settings.c
+++ a/libs/fluidsynth/src/fluid_settings.c
@@ -21,9 +21,6 @@
 #include "fluid_sys.h"
 #include "fluid_hash.h"
 #include "fluid_synth.h"
-#include "fluid_cmd.h"
-#include "fluid_adriver.h"
-#include "fluid_mdriver.h"
 #include "fluid_settings.h"
 #include "fluid_midi.h"
 
@@ -328,11 +325,13 @@ fluid_settings_init(fluid_settings_t *settings)
     fluid_return_if_fail(settings != NULL);
 
     fluid_synth_settings(settings);
+#if 0
     fluid_shell_settings(settings);
     fluid_player_settings(settings);
     fluid_file_renderer_settings(settings);
     fluid_audio_driver_settings(settings);
     fluid_midi_driver_settings(settings);
+#endif
 }
 
 static int
diff --git b/libs/fluidsynth/src/fluid_synth.c a/libs/fluidsynth/src/fluid_synth.c
index a40ba2eaa..e8845632f 100644
--- b/libs/fluidsynth/src/fluid_synth.c
+++ a/libs/fluidsynth/src/fluid_synth.c
@@ -267,7 +267,7 @@ void fluid_version(int *major, int *minor, int *micro)
  * @return FluidSynth version string, which is internal and should not be
  *   modified or freed.
  */
-char *
+const char *
 fluid_version_str(void)
 {
     return FLUIDSYNTH_VERSION;
@@ -6435,6 +6435,7 @@ int fluid_synth_set_channel_type(fluid_synth_t *synth, int chan, int type)
     FLUID_API_RETURN(FLUID_OK);
 }
 
+#ifdef LADSPA
 /**
  * Return the LADSPA effects instance used by FluidSynth
  *
@@ -6447,6 +6448,7 @@ fluid_ladspa_fx_t *fluid_synth_get_ladspa_fx(fluid_synth_t *synth)
 
     return synth->ladspa_fx;
 }
+#endif
 
 /**
  * Configure a general-purpose IIR biquad filter.
diff --git b/libs/fluidsynth/src/fluid_synth.h a/libs/fluidsynth/src/fluid_synth.h
index 95e2c2e5f..96dc54574 100644
--- b/libs/fluidsynth/src/fluid_synth.h
+++ a/libs/fluidsynth/src/fluid_synth.h
@@ -33,8 +33,6 @@
 #include "fluid_rev.h"
 #include "fluid_voice.h"
 #include "fluid_chorus.h"
-#include "fluid_ladspa.h"
-#include "fluid_midi_router.h"
 #include "fluid_rvoice_event.h"
 
 /***************************************************************
@@ -165,7 +163,9 @@ struct _fluid_synth_t
 
     fluid_mod_t *default_mod;          /**< the (dynamic) list of default modulators */
 
+#ifdef LADSPA
     fluid_ladspa_fx_t *ladspa_fx;      /**< Effects unit for LADSPA support */
+#endif
     enum fluid_iir_filter_type custom_filter_type; /**< filter type of the user-defined filter currently used for all voices */
     enum fluid_iir_filter_flags custom_filter_flags; /**< filter type of the user-defined filter currently used for all voices */
 };
diff --git b/libs/fluidsynth/src/fluid_sys.c a/libs/fluidsynth/src/fluid_sys.c
index 5a4a2dd93..c9662f778 100644
--- b/libs/fluidsynth/src/fluid_sys.c
+++ a/libs/fluidsynth/src/fluid_sys.c
@@ -202,9 +202,10 @@ fluid_log(int level, const char *fmt, ...)
  * @param delim String of delimiter chars.
  * @return Pointer to the next token or NULL if no more tokens.
  */
-char *fluid_strtok(char **str, char *delim)
+char *fluid_strtok(char **str, const char *delim)
 {
-    char *s, *d, *token;
+    char *s,  *token;
+		const char *d;
     char c;
 
     if(str == NULL || delim == NULL || !*delim)
diff --git b/libs/fluidsynth/src/fluid_sys.h a/libs/fluidsynth/src/fluid_sys.h
index 47cc95c11..d95f6159f 100644
--- b/libs/fluidsynth/src/fluid_sys.h
+++ a/libs/fluidsynth/src/fluid_sys.h
@@ -91,7 +91,7 @@ else \
 /*
  * Utility functions
  */
-char *fluid_strtok(char **str, char *delim);
+char *fluid_strtok(char **str, const char *delim);
 
 
 #if defined(__OS2__)
diff --git b/libs/fluidsynth/src/fluidsynth_priv.h a/libs/fluidsynth/src/fluidsynth_priv.h
index 41e398398..d500f6174 100644
--- b/libs/fluidsynth/src/fluidsynth_priv.h
+++ a/libs/fluidsynth/src/fluidsynth_priv.h
@@ -26,10 +26,6 @@
 
 #include "config.h"
 
-#if defined(__POWERPC__) && !(defined(__APPLE__) && defined(__MACH__))
-#include "config_maxmsp43.h"
-#endif
-
 #if HAVE_STRING_H
 #include <string.h>
 #endif
@@ -133,8 +129,9 @@ typedef guint64  uint64_t;
 #endif
 
 #if defined(WIN32) &&  HAVE_WINDOWS_H
-#include <winsock2.h>
-#include <ws2tcpip.h>	/* Provides also socklen_t */
+//#include <winsock2.h>
+//#include <ws2tcpip.h>	/* Provides also socklen_t */
+#include <windows.h>
 
 /* WIN32 special defines */
 #define DSOUND_SUPPORT 1