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diff --git a/Medley/src/lib/midi/MIDIDEFS.PAS b/Medley/src/lib/midi/MIDIDEFS.PAS
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+{ $Header: /MidiComp/MIDIDEFS.PAS 2     10/06/97 7:33 Davec $ }
+
+{ Written by David Churcher <dchurcher@cix.compulink.co.uk>,
+  released to the public domain. }
+
+
+{ Common definitions used by DELPHMID.DPR and the MIDI components.
+  This must be a separate unit to prevent large chunks of the VCL being
+  linked into the DLL. }
+unit Mididefs;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+  {$H+} // use long strings
+{$ENDIF}
+
+uses
+  Windows,
+  MMsystem,
+  Circbuf;
+
+type
+
+	{-------------------------------------------------------------------}
+	{ This is the information about the control that must be accessed by
+	  the MIDI input callback function in the DLL at interrupt time }
+	PMidiCtlInfo = ^TMidiCtlInfo;
+	TMidiCtlInfo = record
+		hMem: THandle; 				{ Memory handle for this record }
+		PBuffer: PCircularBuffer;	{ Pointer to the MIDI input data buffer }
+		hWindow: HWnd;					{ Control's window handle }
+		SysexOnly: Boolean;			{ Only process System Exclusive input }
+	end;
+
+	{ Information for the output timer callback function, also required at
+	  interrupt time. }
+	PMidiOutTimerInfo = ^TMidiOutTimerInfo;
+	TMidiOutTimerInfo = record
+		hMem: THandle;				{ Memory handle for this record }
+		PBuffer: PCircularBuffer;	{ Pointer to MIDI output data buffer }
+		hWindow: HWnd;				{ Control's window handle }
+		TimeToNextEvent: DWORD;	{ Delay to next event after timer set }
+		MIDIHandle: HMidiOut;		{ MIDI handle to send output to 
+									(copy of component's FMidiHandle property) }
+		PeriodMin: Word;			{ Multimedia timer minimum period supported }
+		PeriodMax: Word;			{ Multimedia timer maximum period supported }
+		TimerId: Word;				{ Multimedia timer ID of current event }
+	end;
+
+implementation
+
+
+end.