diff --git a/src/sound/mididevices/music_timiditypp_mididevice.cpp b/src/sound/mididevices/music_timiditypp_mididevice.cpp
index e7a0c56cc9..16aad4974a 100644
--- a/src/sound/mididevices/music_timiditypp_mididevice.cpp
+++ b/src/sound/mididevices/music_timiditypp_mididevice.cpp
@@ -37,6 +37,7 @@
 #include "i_musicinterns.h"
 #include "v_text.h"
 #include "doomerrors.h"
+#include "i_soundfont.h"
 
 #include "timiditypp/timidity.h"
 #include "timiditypp/instrum.h"
diff --git a/src/sound/music/i_soundfont.cpp b/src/sound/music/i_soundfont.cpp
index 1df64bddc9..70dc8ffe07 100644
--- a/src/sound/music/i_soundfont.cpp
+++ b/src/sound/music/i_soundfont.cpp
@@ -35,6 +35,7 @@
 #include <ctype.h>
 #include <assert.h>
 #include "i_soundfont.h"
+#include "i_soundinternal.h"
 #include "cmdlib.h"
 #include "i_system.h"
 #include "gameconfigfile.h"
@@ -43,6 +44,33 @@
 
 FSoundFontManager sfmanager;
 
+struct timidity_file_FileReader : public TimidityPlus::timidity_file
+{
+	FileReader fr;
+
+	char* gets(char* buff, int n) override
+	{
+		if (!fr.isOpen()) return nullptr;
+		return fr.Gets(buff, n);
+	}
+	long read(void* buff, int32_t size, int32_t nitems) override
+	{
+		if (!fr.isOpen()) return 0;
+		return (long)fr.Read(buff, size * nitems) / size;
+	}
+	long seek(long offset, int whence) override
+	{
+		if (!fr.isOpen()) return 0;
+		return (long)fr.Seek(offset, (FileReader::ESeek)whence);
+	}
+	long tell() override
+	{
+		if (!fr.isOpen()) return 0;
+		return (long)fr.Tell();
+	}
+
+};
+
 //==========================================================================
 //
 // returns both a file reader and the full name of the looked up file
@@ -122,15 +150,15 @@ FileReader FSoundFontReader::Open(const char *name, std::string& filename)
 //
 //==========================================================================
 
-struct TimidityPlus::timidity_file* FSoundFontReader::open_timidity_file(const char* name)
+struct TimidityPlus::timidity_file* FSoundFontReader::open_timidityplus_file(const char* name)
 {
 	std::string filename;
 
 	FileReader fr = Open(name, filename);
 	if (!fr.isOpen()) return nullptr;
 
-	auto tf = new TimidityPlus::timidity_file;
-	tf->url = std::move(fr);
+	auto tf = new timidity_file_FileReader;
+	tf->fr = std::move(fr);
 	tf->filename = std::move(filename);
 	return tf;
 }
diff --git a/src/sound/music/i_soundfont.h b/src/sound/music/i_soundfont.h
index 80a20486e5..f100ff94fd 100644
--- a/src/sound/music/i_soundfont.h
+++ b/src/sound/music/i_soundfont.h
@@ -3,6 +3,7 @@
 #include "doomtype.h"
 #include "w_wad.h"
 #include "files.h"
+#include "timiditypp/timidity_file.h"
 
 enum
 {
@@ -20,17 +21,13 @@ struct FSoundFontInfo
     int type;
 };
 
-namespace TimidityPlus
-{
-	struct timidity_file;
-}
 //==========================================================================
 //
 //
 //
 //==========================================================================
 
-class FSoundFontReader
+class FSoundFontReader : public TimidityPlus::SoundFontReaderInterface
 {
 protected:
     // This is only doable for loose config files that get set as sound fonts. All other cases read from a contained environment where this does not apply.
@@ -62,7 +59,11 @@ public:
 	}
 
 	virtual FileReader Open(const char* name, std::string &filename);
-	virtual struct TimidityPlus::timidity_file* open_timidity_file(const char* name);
+	virtual struct TimidityPlus::timidity_file* open_timidityplus_file(const char* name);
+	virtual void timidityplus_add_path(const char* name)
+	{
+		return AddPath(name);
+	}
 };
 
 //==========================================================================
diff --git a/src/sound/timidity/timidity.cpp b/src/sound/timidity/timidity.cpp
index 22ec94d978..c52842e3b1 100644
--- a/src/sound/timidity/timidity.cpp
+++ b/src/sound/timidity/timidity.cpp
@@ -36,6 +36,7 @@
 #include "i_musicinterns.h"
 #include "v_text.h"
 #include "timidity.h"
+#include "i_soundfont.h"
 
 CUSTOM_CVAR(String, midi_config, "gzdoom", CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 {
diff --git a/src/sound/timiditypp/common.cpp b/src/sound/timiditypp/common.cpp
index 3ea76febe5..230796d290 100644
--- a/src/sound/timiditypp/common.cpp
+++ b/src/sound/timiditypp/common.cpp
@@ -129,48 +129,27 @@ double flt_rand()
 
 struct timidity_file *open_file(const char *name, SoundFontReaderInterface *sfreader)
 {
-	return sfreader->open_timidity_file(name);
+	return sfreader->open_timidityplus_file(name);
 }
 
 /* This closes files opened with open_file */
 void tf_close(struct timidity_file *tf)
 {
-	tf->url.Close();
 	delete tf;
 }
 
 /* This is meant for skipping a few bytes. */
 void skip(struct timidity_file *tf, size_t len)
 {
-	tf->url.Seek((long)len, FileReader::SeekCur);
-}
-
-char *tf_gets(char *buff, int n, struct timidity_file *tf)
-{
-	return tf->url.Gets(buff, n);
+	tf_seek(tf, (long)len, SEEK_CUR);
 }
 
 int tf_getc(struct timidity_file *tf)
 {
 	unsigned char c;
-	auto read = tf->url.Read(&c, 1);
+	auto read = tf_read(&c, 1, 1, tf);
 	return read == 0 ? EOF : c;
 }
 
-long tf_read(void *buff, int32_t size, int32_t nitems, struct timidity_file *tf)
-{
-	return (long)tf->url.Read(buff, size * nitems) / size;
-}
-
-long tf_seek(struct timidity_file *tf, long offset, int whence)
-{
-
-	return (long)tf->url.Seek(offset, (FileReader::ESeek)whence);
-}
-
-long tf_tell(struct timidity_file *tf)
-{
-	return (long)tf->url.Tell();
-}
 
 }
diff --git a/src/sound/timiditypp/common.h b/src/sound/timiditypp/common.h
index ea38674295..a999f5041d 100644
--- a/src/sound/timiditypp/common.h
+++ b/src/sound/timiditypp/common.h
@@ -27,28 +27,34 @@
 #include <string>
 #include <vector>
 #include <stdint.h>
-#include "files.h"
-#include "i_soundfont.h"
+#include "timidity_file.h"
 
 namespace TimidityPlus
 {
-	//class SoundFontReaderInterface;
-	using SoundFontReaderInterface = FSoundFontReader;
-
-struct timidity_file
+inline char* tf_gets(char* buff, int n, struct timidity_file* tf)
 {
-    FileReader url;
-	std::string filename;
-};
+	return tf->gets(buff, n);
+}
+
+inline long tf_read(void* buff, int32_t size, int32_t nitems, struct timidity_file* tf)
+{
+	return (long)tf->read(buff, size, nitems);
+}
+
+inline long tf_seek(struct timidity_file* tf, long offset, int whence)
+{
+	return (long)tf->seek(offset, whence);
+}
+
+inline long tf_tell(struct timidity_file* tf)
+{
+	return (long)tf->tell();
+}
 
 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);
 int tf_getc(struct timidity_file *tf);
-extern long tf_read(void *buff, int32_t size, int32_t nitems, struct timidity_file *tf);
-extern long tf_seek(struct timidity_file *tf, long offset, int whence);
-extern long tf_tell(struct timidity_file *tf);
 extern int int_rand(int n);	/* random [0..n-1] */
 double flt_rand();
 
diff --git a/src/sound/timiditypp/configfile.cpp b/src/sound/timiditypp/configfile.cpp
index 92ccfc6ed3..a3874e4b27 100644
--- a/src/sound/timiditypp/configfile.cpp
+++ b/src/sound/timiditypp/configfile.cpp
@@ -1397,7 +1397,7 @@ int Instruments::read_config_file(const char *name, int self, int allow_missing_
 				continue;
 			}
 			for (i = 1; i < words; i++)
-                sfreader->AddPath(w[i]);
+                sfreader->timidityplus_add_path(w[i]);
 		}
 		else if (!strcmp(w[0], "source") || !strcmp(w[0], "trysource"))
 		{
diff --git a/src/sound/timiditypp/effect.h b/src/sound/timiditypp/effect.h
index 5cace9dd56..6d65d8e200 100644
--- a/src/sound/timiditypp/effect.h
+++ b/src/sound/timiditypp/effect.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include <stdint.h>
-#include "m_random.h"
 
 #include "timidity.h"
 
diff --git a/src/sound/timiditypp/filter.cpp b/src/sound/timiditypp/filter.cpp
index 1e82de4c58..08dbc83cfe 100644
--- a/src/sound/timiditypp/filter.cpp
+++ b/src/sound/timiditypp/filter.cpp
@@ -36,6 +36,7 @@
 
 #include "common.h"
 #include "filter.h"
+#include "sysdep.h"
 
 namespace TimidityPlus
 {
diff --git a/src/sound/timiditypp/mix.cpp b/src/sound/timiditypp/mix.cpp
index b4b19e2ea7..204dc46ed2 100644
--- a/src/sound/timiditypp/mix.cpp
+++ b/src/sound/timiditypp/mix.cpp
@@ -32,15 +32,10 @@
 #include "resample.h"
 #include "mix.h"
 #include "optcode.h"
-#include "c_cvars.h"
-
-CUSTOM_CVAR(Float, min_sustain_time, 5000, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
-{
-	if (self < 0) self = 0;
-}
 
 namespace TimidityPlus
 {
+extern float min_sustain_time;
 
 
 #define FROM_FINAL_VOLUME(a) (a)
diff --git a/src/sound/timiditypp/playmidi.cpp b/src/sound/timiditypp/playmidi.cpp
index fa4bd43c13..2f134c13b6 100644
--- a/src/sound/timiditypp/playmidi.cpp
+++ b/src/sound/timiditypp/playmidi.cpp
@@ -59,6 +59,7 @@ namespace TimidityPlus
 	float timidity_drum_power = 1.f;
 	int timidity_key_adjust = 0;
 	float timidity_tempo_adjust = 1.f;
+	float min_sustain_time = 5000;
 
 	// The following options have no generic use and are only meaningful for some SYSEX events not normally found in common MIDIs.
 	// For now they are kept as unchanging global variables
@@ -196,6 +197,12 @@ CUSTOM_CVAR(Float, timidity_tempo_adjust, 1, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 	ChangeVarSync(TimidityPlus::timidity_tempo_adjust, *self);
 }
 
+CUSTOM_CVAR(Float, min_sustain_time, 5000, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
+{
+	if (self < 0) self = 0;
+	ChangeVarSync(TimidityPlus::min_sustain_time, *self);
+}
+
 
 namespace TimidityPlus
 {