diff --git a/src/sound/mididevices/music_timiditypp_mididevice.cpp b/src/sound/mididevices/music_timiditypp_mididevice.cpp
index 381551d3a..e7a0c56cc 100644
--- a/src/sound/mididevices/music_timiditypp_mididevice.cpp
+++ b/src/sound/mididevices/music_timiditypp_mididevice.cpp
@@ -45,6 +45,7 @@
 class TimidityPPMIDIDevice : public SoftSynthMIDIDevice
 {
 	static TimidityPlus::Instruments *instruments;
+	static FString configName;
 	int sampletime;
 public:
 	TimidityPPMIDIDevice(const char *args, int samplerate);
@@ -70,6 +71,7 @@ protected:
 	void ComputeOutput(float *buffer, int len);
 };
 TimidityPlus::Instruments *TimidityPPMIDIDevice::instruments;
+FString TimidityPPMIDIDevice::configName;
 
 // Config file to use
 CUSTOM_CVAR(String, timidity_config, "gzdoom", CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
@@ -95,7 +97,7 @@ TimidityPPMIDIDevice::TimidityPPMIDIDevice(const char *args, int samplerate)
 	if (args == NULL || *args == 0) args = timidity_config;
 
 	Renderer = nullptr;
-	if (instruments != nullptr && !instruments->checkConfig(args))
+	if (instruments != nullptr && configName.CompareNoCase(args))	// Only load instruments if they have changed from the last played song.
 	{
 		delete instruments;
 		instruments = nullptr;
@@ -104,11 +106,16 @@ TimidityPPMIDIDevice::TimidityPPMIDIDevice(const char *args, int samplerate)
 
 	if (instruments == nullptr)
 	{
-		instruments = new TimidityPlus::Instruments;
-		if (!instruments->load(args))
+
+		auto sfreader = sfmanager.OpenSoundFont(args, SF_SF2 | SF_GUS);
+		if (sfreader != nullptr)
 		{
-			delete instruments;
-			instruments = nullptr;
+			instruments = new TimidityPlus::Instruments;
+			if (!instruments->load(sfreader))
+			{
+				delete instruments;
+				instruments = nullptr;
+			}
 		}
 	}
 	if (instruments != nullptr)
diff --git a/src/sound/music/i_soundfont.h b/src/sound/music/i_soundfont.h
index 681558a86..9206e11ea 100644
--- a/src/sound/music/i_soundfont.h
+++ b/src/sound/music/i_soundfont.h
@@ -44,6 +44,11 @@ public:
     
     virtual ~FSoundFontReader() {}
     virtual FileReader OpenMainConfigFile() = 0;    // this is special because it needs to be synthesized for .sf files and set some restrictions for patch sets
+	virtual FString MainConfigFileName()
+	{
+		return basePath() + "timidity.cfg";
+	}
+
     virtual FileReader OpenFile(const char *name) = 0;
     std::pair<FileReader , FString> LookupFile(const char *name);
     void AddPath(const char *str);
diff --git a/src/sound/timiditypp/common.cpp b/src/sound/timiditypp/common.cpp
index e9b912f79..8e642d9c9 100644
--- a/src/sound/timiditypp/common.cpp
+++ b/src/sound/timiditypp/common.cpp
@@ -127,14 +127,14 @@ double flt_rand()
 	return (int)GenRand_Real1();
 }
 
-struct timidity_file *open_file(const char *name, FSoundFontReader *sfreader)
+struct timidity_file *open_file(const char *name, SoundFontReaderInterface *sfreader)
 {
     FileReader fr;
     FString filename;
     if (name == nullptr)
     {
         fr = sfreader->OpenMainConfigFile();
-        filename = sfreader->basePath() + "timidity.cfg";
+		filename = sfreader->MainConfigFileName();
     }
     else
     {
diff --git a/src/sound/timiditypp/common.h b/src/sound/timiditypp/common.h
index 74c7070df..ea3867429 100644
--- a/src/sound/timiditypp/common.h
+++ b/src/sound/timiditypp/common.h
@@ -32,6 +32,8 @@
 
 namespace TimidityPlus
 {
+	//class SoundFontReaderInterface;
+	using SoundFontReaderInterface = FSoundFontReader;
 
 struct timidity_file
 {
@@ -39,7 +41,7 @@ struct timidity_file
 	std::string filename;
 };
 
-extern struct timidity_file *open_file(const char *name, FSoundFontReader *);
+extern struct timidity_file *open_file(const char *name, SoundFontReaderInterface *);
 extern void tf_close(struct timidity_file *tf);
 extern void skip(struct timidity_file *tf, size_t len);
 extern char *tf_gets(char *buff, int n, struct timidity_file *tf);
diff --git a/src/sound/timiditypp/configfile.cpp b/src/sound/timiditypp/configfile.cpp
index 445a0985b..92ccfc6ed 100644
--- a/src/sound/timiditypp/configfile.cpp
+++ b/src/sound/timiditypp/configfile.cpp
@@ -643,7 +643,7 @@ int Instruments::read_config_file(const char *name, int self, int allow_missing_
 	{
 		char *c = strdup_mblock(&varbuf, tf->filename.c_str());
 		basedir = c;
-		for (; c; c++) if (*c == '\\') *c = '/';
+		for (; *c; c++) if (*c == '\\') *c = '/';
 		sep = (char*)strrchr(basedir, '/');
 	}
 	else
diff --git a/src/sound/timiditypp/instrum.cpp b/src/sound/timiditypp/instrum.cpp
index 554f01317..ba9f5878e 100644
--- a/src/sound/timiditypp/instrum.cpp
+++ b/src/sound/timiditypp/instrum.cpp
@@ -52,16 +52,13 @@ Instruments::Instruments()
 	memcpy(layer_items, static_layer_items, sizeof(layer_items));
 }
 
-bool Instruments::load(const char *config)
+bool Instruments::load(SoundFontReaderInterface *sf)
 {
-    sfreader = sfmanager.OpenSoundFont(config, SF_SF2 | SF_GUS);
-    if (sfreader == nullptr) return false;
-    
+	sfreader = sf;
 	if (read_config_file(nullptr, 0, 0) == RC_OK)
 	{
 		init_load_soundfont();
 		set_default_instrument();
-		configFileName = config;
 		return true;
 	}
 	return false;
diff --git a/src/sound/timiditypp/instrum.h b/src/sound/timiditypp/instrum.h
index 0119159b3..6b96a0a3a 100644
--- a/src/sound/timiditypp/instrum.h
+++ b/src/sound/timiditypp/instrum.h
@@ -31,7 +31,6 @@
 #include "sflayer.h"
 #include "sfitem.h"
 
-class FSoundFontReader;
 
 namespace TimidityPlus
 {
@@ -233,7 +232,7 @@ struct  SampleImporter;
 class Instruments
 {
 	std::string configFileName;
-    FSoundFontReader *sfreader;
+    SoundFontReaderInterface *sfreader;
 
 	ToneBank standard_tonebank, standard_drumset;
 
@@ -462,7 +461,7 @@ class Instruments
 public:
 
 	Instruments();
-	bool load(const char *config);
+	bool load(SoundFontReaderInterface *);
 	~Instruments();
 
 	const ToneBank *toneBank(int i) const
@@ -556,12 +555,6 @@ public:
 	{
 		set_default_instrument(def_instr_name);
 	}
-
-	bool checkConfig(const char *filename)
-	{
-		return configFileName.compare(filename) == 0;
-	}
-
 };