feat: implement bell filter unit for equalizing

vm/opcodes.go

@@ -5,34 +5,35 @@ const (
 	opAdd        = 1
 	opAddp       = 2
 	opAux        = 3
-	opClip       = 4
-	opCompressor = 5
-	opCrush      = 6
-	opDbgain     = 7
-	opDelay      = 8
-	opDistort    = 9
-	opEnvelope   = 10
-	opFilter     = 11
-	opGain       = 12
-	opHold       = 13
-	opIn         = 14
-	opInvgain    = 15
-	opLoadnote   = 16
-	opLoadval    = 17
-	opMul        = 18
-	opMulp       = 19
-	opNoise      = 20
-	opOscillator = 21
-	opOut        = 22
-	opOutaux     = 23
-	opPan        = 24
-	opPop        = 25
-	opPush       = 26
-	opReceive    = 27
-	opSend       = 28
-	opSpeed      = 29
-	opSync       = 30
-	opXch        = 31
+	opBelleq     = 4
+	opClip       = 5
+	opCompressor = 6
+	opCrush      = 7
+	opDbgain     = 8
+	opDelay      = 9
+	opDistort    = 10
+	opEnvelope   = 11
+	opFilter     = 12
+	opGain       = 13
+	opHold       = 14
+	opIn         = 15
+	opInvgain    = 16
+	opLoadnote   = 17
+	opLoadval    = 18
+	opMul        = 19
+	opMulp       = 20
+	opNoise      = 21
+	opOscillator = 22
+	opOut        = 23
+	opOutaux     = 24
+	opPan        = 25
+	opPop        = 26
+	opPush       = 27
+	opReceive    = 28
+	opSend       = 29
+	opSpeed      = 30
+	opSync       = 31
+	opXch        = 32
 )
 
-var transformCounts = [...]int{0, 0, 1, 0, 5, 1, 1, 4, 1, 5, 2, 1, 1, 0, 1, 0, 1, 0, 0, 2, 6, 1, 2, 1, 0, 0, 0, 1, 0, 0, 0}
+var transformCounts = [...]int{0, 0, 1, 3, 0, 5, 1, 1, 4, 1, 5, 2, 1, 1, 0, 1, 0, 1, 0, 0, 2, 6, 1, 2, 1, 0, 0, 0, 1, 0, 0, 0}