diff --git a/src/opcodes/effects.asm b/src/opcodes/effects.asm
index 0142b73..6337ed6 100644
--- a/src/opcodes/effects.asm
+++ b/src/opcodes/effects.asm
@@ -431,13 +431,16 @@ su_op_delay_loop:
 SECT_TEXT(sucompr)
 
 EXPORT MANGLE_FUNC(su_op_compressor,0)
+    fdiv    dword [INP+su_compres_ports.invgain]; l/g, we'll call this pre inverse gained signal x from now on
     fld     st0                                 ; x x
     fmul    st0, st0                            ; x^2 x
 %ifdef INCLUDE_STEREO_COMPRES
     jnc     su_op_compressor_mono
-    fld     st2                                 ; r l^2 l r
-    fmul    st0, st0                            ; r^2 l^2 l r
-    faddp   st1, st0                            ; r^2+l^2 l r
+    fld     st2                                 ; r x^2 l/g r
+    fdiv    dword [INP+su_compres_ports.invgain]; r/g, we'll call this pre inverse gained signal y from now on
+    fst     st3                                 ; y x^2 l/g r/g
+    fmul    st0, st0                            ; y^2 x^2 l/g r/g
+    faddp   st1, st0                            ; y^2+x^2 l/g r/g
     call    su_op_compressor_mono               ; So, for stereo, we square both left & right and add them up
     fld     st0                                 ; and return the computed gain two times, ready for MULP STEREO
     ret
diff --git a/src/opcodes/effects.inc b/src/opcodes/effects.inc
index ba1d898..df799da 100644
--- a/src/opcodes/effects.inc
+++ b/src/opcodes/effects.inc
@@ -347,15 +347,16 @@ endstruc
         %assign COMPRES_ID CUR_ID
         %assign CUR_ID CUR_ID + 2
         %xdefine OPCODES OPCODES MANGLE_FUNC(su_op_compressor,0),
-        %xdefine NUMPARAMS NUMPARAMS 4,
+        %xdefine NUMPARAMS NUMPARAMS 5,
     %endif
 %endmacro
 
-%macro SU_COMPRES 5
+%macro SU_COMPRES 6
     db  %2
     db  %3
     db  %4
     db  %5
+    db  %6
     USE_COMPRES
     %xdefine CMDS CMDS COMPRES_ID + %1,
     %if %1 == STEREO
@@ -365,12 +366,14 @@ endstruc
 
 %define ATTAC(val)      val
 %define RELEASE(val)    val
+%define INVGAIN(val)    val
 %define THRESHOLD(val)  val
 %define RATIO(val)      val
 
 struc su_compres_ports
     .attack     resd    1
     .release    resd    1
+    .invgain    resd    1
     .threshold  resd    1
     .ratio      resd    1
 endstruc
diff --git a/tests/expected_output/test_compressor.raw b/tests/expected_output/test_compressor.raw
index a9fe6ce..cdab4d0 100644
Binary files a/tests/expected_output/test_compressor.raw and b/tests/expected_output/test_compressor.raw differ
diff --git a/tests/expected_output/test_compressor_stereo.raw b/tests/expected_output/test_compressor_stereo.raw
index 797a6f3..847462a 100644
Binary files a/tests/expected_output/test_compressor_stereo.raw and b/tests/expected_output/test_compressor_stereo.raw differ
diff --git a/tests/test_compressor.asm b/tests/test_compressor.asm
index 6e5895f..7df4cbc 100644
--- a/tests/test_compressor.asm
+++ b/tests/test_compressor.asm
@@ -33,7 +33,7 @@ BEGIN_PATCH
     END_INSTRUMENT
     BEGIN_INSTRUMENT VOICES(1) ; Global compressor effect
         SU_RECEIVE  STEREO
-        SU_COMPRES  MONO,ATTAC(32),RELEASE(80),THRESHOLD(32),RATIO(64)
+        SU_COMPRES  MONO,ATTAC(32),RELEASE(64),INVGAIN(32),THRESHOLD(64),RATIO(96)
         SU_MULP     MONO
         SU_OUT      STEREO, GAIN(128)
     END_INSTRUMENT
diff --git a/tests/test_compressor_stereo.asm b/tests/test_compressor_stereo.asm
index 472bb6c..2d6a390 100644
--- a/tests/test_compressor_stereo.asm
+++ b/tests/test_compressor_stereo.asm
@@ -33,7 +33,7 @@ BEGIN_PATCH
     END_INSTRUMENT
     BEGIN_INSTRUMENT VOICES(1) ; Global compressor effect
         SU_RECEIVE  STEREO
-        SU_COMPRES  STEREO,ATTAC(32),RELEASE(80),THRESHOLD(32),RATIO(64)
+        SU_COMPRES  STEREO,ATTAC(32),RELEASE(64),INVGAIN(32),THRESHOLD(64),RATIO(96)
         SU_MULP     STEREO
         SU_OUT      STEREO, GAIN(128)
     END_INSTRUMENT