diff --git a/MBMlib/MBMlib.rel b/MBMlib/MBMlib.rel
index 2cbc11f..81e2c66 100644
--- a/MBMlib/MBMlib.rel
+++ b/MBMlib/MBMlib.rel
@@ -1,12 +1,18 @@
 XL2
-H 9 areas 26 global symbols
+H 9 areas 32 global symbols
 M MBMlib
 O -mz80
 S _SMS_Port3EBIOSvalue Ref0000
 S .__.ABS. Def0000
-A _CODE size 7CB flags 0 addr 0
+A _CODE size 8AB flags 0 addr 0
+S _MBMSFXPlay Def07CB
+S _MBMSFXCancelLoop Def07FA
+S _MBMSFXGetStatus Def0848
 S _MBMPlay Def0000
+S _MBMSFXStop Def0800
+S _MBMSFXFrame Def0850
 S _MBMCancelLoop Def0153
+S _MBMSFXPlayLoop Def07F1
 S _MBMGetStatus Def01B2
 S _SMS_GetFMAudioCapabilities Def0770
 S _MBMStop Def0169
@@ -18,19 +24,24 @@ S _MBMFreqencyLUT Def01BA
 S _MBMPlayNoRepeat Def0159
 S _MBMDrumReg Def027A
 S _MBMModVal Def0283
-A _DATA size A8 flags 0 addr 0
+A _DATA size B1 flags 0 addr 0
 S _MBMChannelInfo Def00A4
+S _MBMSFXLoopFlag Def00AF
 S _MBMFading Def001F
 S _MBMStart Def0001
 S _MBMFadeCounter Def0020
 S _MBMSpeedCounter Def0018
+S _MBMSFXDelayIVR Def00B0
+S _MBMSFXPointer Def00AA
 S _MBMChannelBuffer Def0021
 S _MBMPosition Def0003
+S _MBMSFXLoopPoint Def00AC
 S _MBMStatusByte Def0005
 S _MBMStep Def0004
 S _MBMPatternAddress Def0019
 S _MBMLoopPoint Def00A5
 S _MBMPAT Def001D
+S _MBMSFXSkipFrames Def00AE
 S _MBMSpeed Def0017
 S _MBMFrequency Def0015
 S _MBMSFXStatus Def00A7
@@ -40,6 +51,7 @@ S _MBMSongLength Def00A3
 S _MBMTransposeValue Def0016
 S _MBMDrumBlockAddr Def00A1
 S _MBMPatternPointer Def001B
+S _MBMSFXStart Def00A8
 S _MBMLastCustInstr Def00A6
 S _MBMStatus Def0000
 A _INITIALIZED size 0 flags 0 addr 0
@@ -141,6 +153,30 @@ T A7 00
 R 00 00 01 00
 T A7 00
 R 00 00 01 00
+T A8 00
+R 00 00 01 00
+T A8 00
+R 00 00 01 00
+T AA 00
+R 00 00 01 00
+T AA 00
+R 00 00 01 00
+T AC 00
+R 00 00 01 00
+T AC 00
+R 00 00 01 00
+T AE 00
+R 00 00 01 00
+T AE 00
+R 00 00 01 00
+T AF 00
+R 00 00 01 00
+T AF 00
+R 00 00 01 00
+T B0 00
+R 00 00 01 00
+T B0 00
+R 00 00 01 00
 T 00 00
 R 00 00 00 00
 T 00 00 FD 21 01 00 FD 75 00 FD 74 01 DD E5 3A
@@ -721,3 +757,77 @@ T BB 07 3A 00 00 F6 04 D3 3E 7D D3 F2 3A 00 00 D3
 R 00 00 00 00 02 03 00 00 02 0D 00 00
 T C9 07 3E C9
 R 00 00 00 00
+T CB 07
+R 00 00 00 00
+T CB 07 FD 21 A8 00 FD 75 00 FD 74 01 AF 32 AF 00
+R 00 00 00 00 00 04 01 00 00 0E 01 00
+T D9 07 CD 33 08 3C 32 A7 00 32 AE 00 2A
+R 00 00 00 00 00 03 00 00 00 07 01 00 00 0A 01 00
+T E4 07 A8 00 22 AA 00 22 AC 00 AF 32
+R 00 00 00 00 00 02 01 00 00 05 01 00 00 08 01 00
+T EE 07 B0 00 C9
+R 00 00 00 00 00 02 01 00
+T F1 07
+R 00 00 00 00
+T F1 07 CD CB 07 21 AF 00 36 01 C9
+R 00 00 00 00 00 03 00 00 00 06 01 00
+T FA 07
+R 00 00 00 00
+T FA 07 21 AF 00 36 00 C9
+R 00 00 00 00 00 03 01 00
+T 00 08
+R 00 00 00 00
+T 00 08 3E 16 32 B0 00 C3 33 08
+R 00 00 00 00 00 05 01 00 00 08 00 00
+T 08 08
+R 00 00 00 00
+T 08 08 AF 32 A7 00 32 B0 00 3A 27 00 3D 06 00 87
+R 00 00 00 00 00 04 01 00 00 07 01 00 00 0A 01 00
+T 16 08 4F 2A 9F 00 09 7E FE 10 38 01 AF
+R 00 00 00 00 00 04 01 00
+T 21 08
+R 00 00 00 00
+T 21 08 07 07 07 07 47 3A 2E 00 CB 3F CB 3F A8 0E
+R 00 00 00 00 00 08 01 00
+T 2F 08 30 C3 68 07
+R 00 00 00 00 00 04 00 00
+T 33 08
+R 00 00 00 00
+T 33 08 AF 0E 10 CD 68 07 00 00 00 00 00 00 D6 00
+R 00 00 00 00 00 06 00 00
+T 41 08 D6 00 0E 20 C3 68 07
+R 00 00 00 00 00 07 00 00
+T 48 08
+R 00 00 00 00
+T 48 08 FD 21 A7 00 FD 6E 00 C9
+R 00 00 00 00 00 04 01 00
+T 50 08
+R 00 00 00 00
+T 50 08 3A A7 00 B7 C8 3A B0 00 FE 01 DA 65 08 CA
+R 00 00 00 00 00 03 01 00 00 08 01 00 00 0D 00 00
+T 5E 08 08 08 3D 32 B0 00 C9
+R 00 00 00 00 00 02 00 00 00 06 01 00
+T 65 08
+R 00 00 00 00
+T 65 08 3A AE 00 3D 32 AE 00 C0 2A AA 00
+R 00 00 00 00 00 03 01 00 00 07 01 00 00 0B 01 00
+T 70 08
+R 00 00 00 00
+T 70 08 7E FE 10 DA 8C 08 FE FF C2 82 08 23 22
+R 00 00 00 00 00 06 00 00 00 0B 00 00
+T 7D 08 AC 00 C3 70 08
+R 00 00 00 00 00 02 01 00 00 05 00 00
+T 82 08
+R 00 00 00 00
+T 82 08 4F 23 7E CD 68 07 23 C3 70 08
+R 00 00 00 00 00 06 00 00 00 0A 00 00
+T 8C 08
+R 00 00 00 00
+T 8C 08 B7 CA 98 08 32 AE 00 23 22 AA 00 C9
+R 00 00 00 00 00 04 00 00 00 07 01 00 00 0B 01 00
+T 98 08
+R 00 00 00 00
+T 98 08 3A AF 00 B7 CA 00 08 3E 01 32 AE 00 2A
+R 00 00 00 00 00 03 01 00 00 07 00 00 00 0C 01 00
+T A5 08 AC 00 22 AA 00 C9
+R 00 00 00 00 00 02 01 00 00 05 01 00
diff --git a/MBMlib/src/MBMlib.c b/MBMlib/src/MBMlib.c
index 310d31b..bc717c0 100644
--- a/MBMlib/src/MBMlib.c
+++ b/MBMlib/src/MBMlib.c
@@ -1,7 +1,7 @@
 /* **************************************************
    MBMlib - C programming library for Moonblaster modules replay
    ( part of devkitSMS - github.com/sverx/devkitSMS )
-   code: Kagesan, sverx
+   code: 'Remco Schrijvers / MoonSoft', Kagesan, sverx
    ************************************************** */
 
 #define MBMIVLIST_OFFSET           #0x00A3
@@ -65,7 +65,14 @@ unsigned char MBMLoopPoint;        // loop position
 
 unsigned char MBMLastCustInstr;    // last programmed custom instrument
 
-unsigned char MBMSFXStatus;        // SFX status (TO DO)
+// SFX variables
+unsigned char MBMSFXStatus;        // SFX status
+void* MBMSFXStart;                 // ROM address of SFX
+void* MBMSFXPointer;               // current address
+void* MBMSFXLoopPoint;             // the pointer to the loop begin
+unsigned char MBMSFXSkipFrames;    // wait counter for empty frames
+unsigned char MBMSFXLoopFlag;      // looping? 1= yes, 0 = no
+unsigned char MBMSFXDelayIVR;      // delay until instrument and volume are restored
 
 void MBMPlay (void *module) __z88dk_fastcall __naked {
 
@@ -1295,3 +1302,148 @@ void SMS_EnableAudio (unsigned char chips) __z88dk_fastcall __naked {
   __endasm;
 }
 #pragma restore
+
+// SFX
+
+void MBMSFXPlay (void *sound_effect) __z88dk_fastcall __naked {
+
+  MBMSFXStart=sound_effect;
+
+  __asm
+    xor a                           ; SFX is _NOT_ a looping one
+    ld (_MBMSFXLoopFlag),a
+    call MBMSFXSilence              ; stop any sfx that might be playing
+    inc a
+    ld (_MBMSFXStatus), a           ; set status to "playing"
+    ld (_MBMSFXSkipFrames), a       ; next frame follows immediately
+    ld hl,(_MBMSFXStart)            ; set pointer to start of sfx data
+    ld (_MBMSFXPointer), hl
+    ld (_MBMSFXLoopPoint), hl       ; loop pointer also points at the start for now
+    xor a
+    ld (_MBMSFXDelayIVR), a
+    ret
+  __endasm;
+}
+
+void MBMSFXPlayLoop (void *sound_effect) __z88dk_fastcall {
+  MBMSFXPlay (sound_effect);
+  MBMSFXLoopFlag=1;
+}
+
+void MBMSFXCancelLoop (void) {
+  MBMSFXLoopFlag=0;
+}
+
+void MBMSFXStop (void) __naked {
+  __asm
+    ld a, #22                       ; set number of frames until I/V restore
+    ld (_MBMSFXDelayIVR), a
+    jp MBMSFXSilence                ; zero frequency
+
+MBMSFXRestoreInstrVol:
+    xor a
+    ld (_MBMSFXStatus), a           ; reset status to "not playing"
+    ld (_MBMSFXDelayIVR), a         ; reset delay timer
+    ld a, (_MBMChannelBuffer+6)     ; get instrument number
+    dec a
+    ld b, #0
+    add a, a
+    ld c, a
+    ld hl,(_MBMIVListAddr)
+    add hl, bc
+    ld a, (hl)                      ; get instrument from list
+    cp #16
+    jr c, _is_not_custom
+    xor a
+_is_not_custom:
+    rlca                            ; move instrument into upper nibble
+    rlca
+    rlca
+    rlca
+    ld b, a
+    ld a, (_MBMChannelBuffer+13)    ; get volume
+    srl a
+    srl a
+    xor b                           ; combine volume with instrument
+    ld c, #0x30
+    jp FMOut                        ; restore instrument and volume, return
+
+MBMSFXSilence:
+    xor a
+    ld c, #0x10                     ; set frequency to zero, key off
+    call FMOut
+    nop        ;*
+    nop        ;*
+    nop        ;*
+    nop        ;*
+    nop        ;*
+    nop        ;*
+    sub #0     ;*
+    sub #0     ;*
+    ld c, #0x20
+    jp FMOut
+  __endasm;
+}
+
+unsigned char MBMSFXGetStatus (void) {
+  return MBMSFXStatus;
+}
+
+void MBMSFXFrame (void) __naked {
+  __asm
+    ld a, (_MBMSFXStatus)           ; check if sfx is playing
+    or a                            ; no?
+    ret z                           ; then just return
+
+    ld a, (_MBMSFXDelayIVR)         ; check if inside delay period
+    cp #1
+    jp c, _proceed                  ; if not, proceed with sfx
+    jp z, MBMSFXRestoreInstrVol     ; if end of delay, restore instrument/volume, end sfx
+    dec a                           ; else reduce timer
+    ld (_MBMSFXDelayIVR), a         ; store new value
+    ret
+
+_proceed:
+    ld a, (_MBMSFXSkipFrames)       ; check if there are empty frames to skip
+    dec a
+    ld (_MBMSFXSkipFrames), a
+    ret nz
+
+    ld hl, (_MBMSFXPointer)
+_sfx_loop:
+    ld a, (hl)                      ; read command / register
+    cp #16
+    jp c, _EndFrame
+    cp #255                         ; check if loop point
+    jp nz, _loop_point
+    inc hl
+    ld (_MBMSFXLoopPoint), hl       ; set loop point
+    jp _sfx_loop
+
+_loop_point:
+    ld c, a                         ; if a > 15, then it is a register number
+    inc hl                          ; move to data byte
+    ld a, (hl)                      ; read data byte
+    call FMOut
+    inc hl                          ; move to next command / register byte
+    jp _sfx_loop                    ; repeat until frame ends
+
+_EndFrame:
+    or a                            ; check if end of sfx
+    jp z, _EndSFX
+    ld (_MBMSFXSkipFrames), a       ; store wait frames
+    inc hl
+    ld (_MBMSFXPointer), hl
+    ret
+
+_EndSFX:
+    ld a, (_MBMSFXLoopFlag)         ; check if sfx is looping
+    or a                            ; no?
+    jp z, _MBMSFXStop               ; then stop sfx, restore instrument and volume
+    ld a, #1
+    ld (_MBMSFXSkipFrames), a       ; next frame follows immediately
+    ld hl, (_MBMSFXLoopPoint)       ; set pointer back to loop point
+    ld (_MBMSFXPointer), hl
+    ret
+  __endasm;
+}
diff --git a/MBMlib/src/MBMlib.h b/MBMlib/src/MBMlib.h
index b32a129..4902de3 100644
--- a/MBMlib/src/MBMlib.h
+++ b/MBMlib/src/MBMlib.h
@@ -1,7 +1,7 @@
 /* **************************************************
    MBMlib - C programming library for Moonblaster modules replay
    ( part of devkitSMS - github.com/sverx/devkitSMS )
-   code: Kagesan, sverx
+   code: 'Remco Schrijvers / MoonSoft', Kagesan, sverx
    ************************************************** */
 
 #define MBM_STOPPED         0
@@ -34,3 +34,18 @@ unsigned char SMS_GetFMAudioCapabilities (void) __naked;
 #define SMS_ENABLE_AUDIO_NONE      0x02
 
 void SMS_EnableAudio (unsigned char chips) __z88dk_fastcall __naked;
+
+/* SFX */
+
+#define MBMSFX_STOPPED         0
+#define MBMSFX_PLAYING         1
+
+void MBMSFXPlay (void *sound_effect) __z88dk_fastcall __naked;
+void MBMSFXPlayLoop (void *sound_effect) __z88dk_fastcall;
+void MBMSFXCancelLoop (void);
+
+void MBMSFXStop (void) __naked;
+
+unsigned char MBMSFXGetStatus (void);
+
+void MBMSFXFrame (void) __naked;