diff --git a/source/audiolib/src/_oplmidi.h b/source/audiolib/src/_oplmidi.h
deleted file mode 100644
index 20cde2e67..000000000
--- a/source/audiolib/src/_oplmidi.h
+++ /dev/null
@@ -1,151 +0,0 @@
-//-------------------------------------------------------------------------
-/*
-Copyright (C) 2010-2019 EDuke32 developers and contributors
-Copyright (C) 2019 Nuke.YKT
-
-This file is part of NBlood.
-
-NBlood is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License version 2
-as published by the Free Software Foundation.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-*/
-//-------------------------------------------------------------------------
-
-#ifndef ___MIDI_H
-#define ___MIDI_H
-#include "compat.h"
-
-namespace OPLMusic {
-#define RELATIVE_BEAT( measure, beat, tick ) \
-   ( ( tick ) + ( ( beat ) << 9 ) + ( ( measure ) << 16 ) )
-
-//Bobby Prince thinks this may be 100
-//#define GENMIDI_DefaultVolume 100
-#define GENMIDI_DefaultVolume 90
-
-#define MAX_FORMAT            1
-
-#define NUM_MIDI_CHANNELS     16
-
-#define TIME_PRECISION        16
-
-#define MIDI_HEADER_SIGNATURE 0x6468544d    // "MThd"
-#define MIDI_TRACK_SIGNATURE  0x6b72544d    // "MTrk"
-
-#define MIDI_VOLUME                7
-#define MIDI_PAN                   10
-#define MIDI_DETUNE                94
-#define MIDI_RHYTHM_CHANNEL        9
-#define MIDI_RPN_MSB               100
-#define MIDI_RPN_LSB               101
-#define MIDI_DATAENTRY_MSB         6
-#define MIDI_DATAENTRY_LSB         38
-#define MIDI_PITCHBEND_MSB         0
-#define MIDI_PITCHBEND_LSB         0
-#define MIDI_RUNNING_STATUS        0x80
-#define MIDI_NOTE_OFF              0x8
-#define MIDI_NOTE_ON               0x9
-#define MIDI_POLY_AFTER_TCH        0xA
-#define MIDI_CONTROL_CHANGE        0xB
-#define MIDI_PROGRAM_CHANGE        0xC
-#define MIDI_AFTER_TOUCH           0xD
-#define MIDI_PITCH_BEND            0xE
-#define MIDI_SPECIAL               0xF
-#define MIDI_SYSEX                 0xF0
-#define MIDI_SYSEX_CONTINUE        0xF7
-#define MIDI_META_EVENT            0xFF
-#define MIDI_END_OF_TRACK          0x2F
-#define MIDI_TEMPO_CHANGE          0x51
-#define MIDI_TIME_SIGNATURE        0x58
-#define MIDI_RESET_ALL_CONTROLLERS 0x79
-#define MIDI_ALL_NOTES_OFF         0x7b
-#define MIDI_MONO_MODE_ON          0x7E
-#define MIDI_SYSTEM_RESET          0xFF
-
-#define GET_NEXT_EVENT( track, data ) do { \
-    ( data ) = *( track )->pos; \
-    ( track )->pos += 1; \
-} while (0)
-
-#define GET_MIDI_CHANNEL( event )       ( ( event ) & 0xf )
-#define GET_MIDI_COMMAND( event )       ( ( event ) >> 4 )
-
-#define EMIDI_INFINITE          -1
-#define EMIDI_END_LOOP_VALUE    127
-#define EMIDI_ALL_CARDS         127
-#define EMIDI_INCLUDE_TRACK     110
-#define EMIDI_EXCLUDE_TRACK     111
-#define EMIDI_PROGRAM_CHANGE    112
-#define EMIDI_VOLUME_CHANGE     113
-#define EMIDI_CONTEXT_START     114
-#define EMIDI_CONTEXT_END       115
-#define EMIDI_LOOP_START        116
-#define EMIDI_LOOP_END          117
-#define EMIDI_SONG_LOOP_START   118
-#define EMIDI_SONG_LOOP_END     119
-
-#define EMIDI_GeneralMIDI       0
-#define EMIDI_SoundBlaster      4
-
-#define EMIDI_AffectsCurrentCard(c, type) (((c) == EMIDI_ALL_CARDS) || ((c) == (type)))
-#define EMIDI_NUM_CONTEXTS      7
-
-typedef struct
-{
-    char *pos;
-    char *loopstart;
-    int16_t loopcount;
-    int16_t RunningStatus;
-    unsigned time;
-    int32_t FPSecondsPerTick;
-    int16_t tick;
-    int16_t beat;
-    int16_t measure;
-    int16_t BeatsPerMeasure;
-    int16_t TicksPerBeat;
-    int16_t TimeBase;
-    int32_t delay;
-    int16_t active;
-} songcontext;
-
-typedef struct
-{
-    char *start;
-    char *pos;
-
-    int32_t delay;
-    int16_t active;
-    int16_t RunningStatus;
-
-    int16_t currentcontext;
-    songcontext context[EMIDI_NUM_CONTEXTS];
-
-    char EMIDI_IncludeTrack;
-    char EMIDI_ProgramChange;
-    char EMIDI_VolumeChange;
-} track;
-
-static int32_t _MIDI_ReadNumber(void *from, size_t size);
-static int32_t _MIDI_ReadDelta(track *ptr);
-static void _MIDI_ResetTracks(void);
-static void _MIDI_AdvanceTick(void);
-static void _MIDI_MetaEvent(track *Track);
-static void _MIDI_SysEx(track *Track);
-static int32_t _MIDI_InterpretControllerInfo(track *Track, int32_t TimeSet, int32_t channel, int32_t c1, int32_t c2);
-static int32_t _MIDI_SendControlChange(int32_t channel, int32_t c1, int32_t c2);
-static void _MIDI_SetChannelVolume(int32_t channel, int32_t volume);
-static void _MIDI_SendChannelVolumes(void);
-static void _MIDI_InitEMIDI(void);
-
-}
-#endif