diff --git a/src/sfloader/fluid_defsfont.c b/src/sfloader/fluid_defsfont.c
index f473db4c..e5749044 100644
--- a/src/sfloader/fluid_defsfont.c
+++ b/src/sfloader/fluid_defsfont.c
@@ -374,6 +374,7 @@ int fluid_defsfont_load_all_sampledata(fluid_defsfont_t *defsfont, SFData *sfdat
     fluid_list_t *list;
     fluid_sample_t *sample;
     int sf3_file = (sfdata->version.major == 3);
+    int sample_parsing_result = FLUID_OK;
 
     /* For SF2 files, we load the sample data in one large block */
     if(!sf3_file)
@@ -392,6 +393,8 @@ int fluid_defsfont_load_all_sampledata(fluid_defsfont_t *defsfont, SFData *sfdat
         }
     }
 
+    #pragma omp parallel
+    #pragma omp single
     for(list = defsfont->sample; list; list = fluid_list_next(list))
     {
         sample = fluid_list_get(list);
@@ -400,13 +403,22 @@ int fluid_defsfont_load_all_sampledata(fluid_defsfont_t *defsfont, SFData *sfdat
         {
             /* SF3 samples get loaded individually, as most (or all) of them are in Ogg Vorbis format
              * anyway */
-            if(fluid_defsfont_load_sampledata(defsfont, sfdata, sample) == FLUID_FAILED)
+            #pragma omp task firstprivate(sample,sfdata,defsfont) shared(sample_parsing_result) default(none)
             {
-                FLUID_LOG(FLUID_ERR, "Failed to load sample '%s'", sample->name);
-                return FLUID_FAILED;
+                if(fluid_defsfont_load_sampledata(defsfont, sfdata, sample) == FLUID_FAILED)
+                {
+                    #pragma omp critical
+                    {
+                        FLUID_LOG(FLUID_ERR, "Failed to load sample '%s'", sample->name);
+                        sample_parsing_result = FLUID_FAILED;
+                    }
+                }
+                else
+                {
+                    fluid_sample_sanitize_loop(sample, (sample->end + 1) * sizeof(short));
+                    fluid_voice_optimize_sample(sample);
+                }
             }
-
-            fluid_sample_sanitize_loop(sample, (sample->end + 1) * sizeof(short));
         }
         else
         {
@@ -414,12 +426,11 @@ int fluid_defsfont_load_all_sampledata(fluid_defsfont_t *defsfont, SFData *sfdat
             sample->data = defsfont->sampledata;
             sample->data24 = defsfont->sample24data;
             fluid_sample_sanitize_loop(sample, defsfont->samplesize);
+            fluid_voice_optimize_sample(sample);
         }
-
-        fluid_voice_optimize_sample(sample);
     }
 
-    return FLUID_OK;
+    return sample_parsing_result;
 }
 
 /*
diff --git a/src/sfloader/fluid_samplecache.c b/src/sfloader/fluid_samplecache.c
index 2d70d7e8..64e9e9e7 100644
--- a/src/sfloader/fluid_samplecache.c
+++ b/src/sfloader/fluid_samplecache.c
@@ -89,6 +89,7 @@ int fluid_samplecache_load(SFData *sf,
 
     if(entry == NULL)
     {
+        fluid_mutex_unlock(samplecache_mutex);
         entry = new_samplecache_entry(sf, sample_start, sample_end, sample_type, mtime);
 
         if(entry == NULL)
@@ -97,8 +98,10 @@ int fluid_samplecache_load(SFData *sf,
             goto unlock_exit;
         }
 
+        fluid_mutex_lock(samplecache_mutex);
         samplecache_list = fluid_list_prepend(samplecache_list, entry);
     }
+        fluid_mutex_unlock(samplecache_mutex);
 
     if(try_mlock && !entry->mlocked)
     {
@@ -129,7 +132,6 @@ int fluid_samplecache_load(SFData *sf,
     ret = entry->sample_count;
 
 unlock_exit:
-    fluid_mutex_unlock(samplecache_mutex);
     return ret;
 }
 
diff --git a/src/sfloader/fluid_sffile.c b/src/sfloader/fluid_sffile.c
index 6dbc307b..614dfe26 100644
--- a/src/sfloader/fluid_sffile.c
+++ b/src/sfloader/fluid_sffile.c
@@ -422,6 +422,7 @@ SFData *fluid_sffile_open(const char *fname, const fluid_file_callbacks_t *fcbs)
 
     FLUID_MEMSET(sf, 0, sizeof(SFData));
 
+    fluid_rec_mutex_init(sf->mtx);
     sf->fcbs = fcbs;
 
     if((sf->sffd = fcbs->fopen(fname)) == NULL)
@@ -530,6 +531,7 @@ void fluid_sffile_close(SFData *sf)
     SFPreset *preset;
     SFInst *inst;
 
+    fluid_rec_mutex_destroy(sf->mtx);
     if(sf->sffd)
     {
         sf->fcbs->fclose(sf->sffd);
@@ -2529,10 +2531,14 @@ static sf_count_t sfvio_seek(sf_count_t offset, int whence, void *user_data)
         goto fail; /* proper error handling not possible?? */
     }
 
-    if(sf->fcbs->fseek(sf->sffd, sf->samplepos + data->start + new_offset, SEEK_SET) != FLUID_FAILED)
+    new_offset += data->start;
+    fluid_rec_mutex_lock(sf->mtx);
+    if (data->start <= new_offset && new_offset <= data->end &&
+        sf->fcbs->fseek(sf->sffd, new_offset, SEEK_SET) != FLUID_FAILED)
     {
-        data->offset = new_offset;
+        data->offset = new_offset - data->start;
     }
+    fluid_rec_mutex_unlock(sf->mtx);
 
 fail:
     return data->offset;
@@ -2556,11 +2562,21 @@ static sf_count_t sfvio_read(void *ptr, sf_count_t count, void *user_data)
         return count;
     }
 
-    if(sf->fcbs->fread(ptr, count, sf->sffd) == FLUID_FAILED)
+    fluid_rec_mutex_lock(sf->mtx);
+    if (sf->fcbs->fseek(sf->sffd, data->start + data->offset, SEEK_SET) == FLUID_FAILED)
     {
-        FLUID_LOG(FLUID_ERR, "Failed to read compressed sample data");
-        return 0;
+        FLUID_LOG(FLUID_ERR, "This should never happen: fseek failed in sfvoid_read()");
+        count = 0;
     }
+    else
+    {
+        if (sf->fcbs->fread(ptr, count, sf->sffd) == FLUID_FAILED)
+        {
+            FLUID_LOG(FLUID_ERR, "Failed to read compressed sample data");
+            count = 0;
+        }
+    }
+    fluid_rec_mutex_unlock(sf->mtx);
 
     data->offset += count;
 
@@ -2607,25 +2623,26 @@ static int fluid_sffile_read_vorbis(SFData *sf, unsigned int start_byte, unsigne
 
     // Initialize file position indicator and SF_INFO structure
     sfdata.sffile = sf;
-    sfdata.start = start_byte;
-    sfdata.end = end_byte;
-    sfdata.offset = 0;
+    sfdata.start = sf->samplepos + start_byte;
+    sfdata.end = sf->samplepos + end_byte;
+    sfdata.offset = -1;
 
-    FLUID_MEMSET(&sfinfo, 0, sizeof(sfinfo));
-
-    /* Seek to beginning of Ogg Vorbis data in Soundfont */
-    if(sf->fcbs->fseek(sf->sffd, sf->samplepos + start_byte, SEEK_SET) == FLUID_FAILED)
+    /* Seek to sfdata.start, the beginning of Ogg Vorbis data in Soundfont */
+    sfvio_seek(0, SEEK_SET, &sfdata);
+    if (sfdata.offset != 0)
     {
-        FLUID_LOG(FLUID_ERR, "Failed to seek to compressd sample position");
+        FLUID_LOG(FLUID_ERR, "Failed to seek to compressed sample position");
         return -1;
     }
 
+    FLUID_MEMSET(&sfinfo, 0, sizeof(sfinfo));
+
     // Open sample as a virtual file
     sndfile = sf_open_virtual(&sfvio, SFM_READ, &sfinfo, &sfdata);
 
     if(!sndfile)
     {
-        FLUID_LOG(FLUID_ERR, "%s", sf_strerror(sndfile));
+        FLUID_LOG(FLUID_ERR, "sf_open_virtual(): %s", sf_strerror(sndfile));
         return -1;
     }
 
@@ -2662,7 +2679,7 @@ static int fluid_sffile_read_vorbis(SFData *sf, unsigned int start_byte, unsigne
     if(sf_readf_short(sndfile, wav_data, sfinfo.frames) < sfinfo.frames)
     {
         FLUID_LOG(FLUID_DBG, "Decompression failed!");
-        FLUID_LOG(FLUID_ERR, "%s", sf_strerror(sndfile));
+        FLUID_LOG(FLUID_ERR, "sf_readf_short(): %s", sf_strerror(sndfile));
         goto error_exit;
     }
 
diff --git a/src/sfloader/fluid_sffile.h b/src/sfloader/fluid_sffile.h
index 9ee86b3d..8dc53c79 100644
--- a/src/sfloader/fluid_sffile.h
+++ b/src/sfloader/fluid_sffile.h
@@ -29,7 +29,7 @@
 #include "fluid_list.h"
 #include "fluid_mod.h"
 #include "fluidsynth.h"
-#include "fluidsynth_priv.h"
+#include "fluid_sys.h"
 
 
 /* Sound Font structure defines */
@@ -159,6 +159,8 @@ struct _SFData
     FILE *sffd; /* loaded sfont file descriptor */
     const fluid_file_callbacks_t *fcbs; /* file callbacks used to read this file */
 
+    fluid_rec_mutex_t mtx; /* this mutex can be used to synchronize calls to fcbs when using multiple threads (e.g. SF3 loading) */
+
     fluid_list_t *info; /* linked list of info strings (1st byte is ID) */
     fluid_list_t *preset; /* linked list of preset info */
     fluid_list_t *inst; /* linked list of instrument info */