diff --git a/src/xspice/icm/xtradev/seegenerator/cfunc.mod b/src/xspice/icm/xtradev/seegenerator/cfunc.mod
index 55bad8000..5361fbca8 100644
--- a/src/xspice/icm/xtradev/seegenerator/cfunc.mod
+++ b/src/xspice/icm/xtradev/seegenerator/cfunc.mod
@@ -130,6 +130,7 @@ void cm_seegen(ARGS)  /* structure holding parms,
     double tdelay;           /* delay until first pulse */
     double inull;            /* max. current of pulse */
     double tperiod;          /* pulse repetition period */
+    double ctrlthres;        /* control voltage threshold */
     double ctrl;             /* control input */
     double out;              /* output current */
     double *last_t_value;    /* static storage of next pulse time */
@@ -145,6 +146,7 @@ void cm_seegen(ARGS)  /* structure holding parms,
     tdelay = PARAM(tdelay);
     tperiod = PARAM(tperiod);
     inull = PARAM(inull);
+    ctrlthres = PARAM(ctrlthres);
 
     if (PORT_NULL(ctrl))
         ctrl = 1;
@@ -169,7 +171,7 @@ void cm_seegen(ARGS)  /* structure holding parms,
         pulse_number = (int *) STATIC_VAR(pulse_number);
         last_ctrl = (double *) STATIC_VAR(last_ctrl);
 
-        if (*last_ctrl < 0.5 && ctrl >= 0.5) {
+        if (*last_ctrl < ctrlthres && ctrl >= ctrlthres) {
             *last_t_value = *last_t_value + tcurr;
             *last_ctrl = ctrl;
         }
diff --git a/src/xspice/icm/xtradev/seegenerator/ifspec.ifs b/src/xspice/icm/xtradev/seegenerator/ifspec.ifs
index 08f3c45f0..cf232e915 100644
--- a/src/xspice/icm/xtradev/seegenerator/ifspec.ifs
+++ b/src/xspice/icm/xtradev/seegenerator/ifspec.ifs
@@ -65,14 +65,14 @@ Null_Allowed:       yes                    yes
 
 PARAMETER_TABLE:
 
-Parameter_Name:     tperiod
-Description:        "pulse repetition"
-Data_Type:          real
-Default_Value:      0
-Limits:             -
-Vector:              no
-Vector_Bounds:       -
-Null_Allowed:       yes
+Parameter_Name:     tperiod                ctrlthres
+Description:        "pulse repetition"     "control voltage threshold"
+Data_Type:          real                   real
+Default_Value:      0                      0.5
+Limits:             -                      -
+Vector:              no                    no
+Vector_Bounds:      -                      -
+Null_Allowed:       yes                    yes
 
 STATIC_VAR_TABLE: