3 files changed, 8 insertions, 2 deletions
diff --git a/gnuradio-core/src/lib/filter/gr_single_pole_iir.h b/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
index da919b35c..8781065d4 100644
--- a/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
+++ b/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
@@ -71,7 +71,7 @@ public:
     d_prev_output = 0;
   }
 
-  o_type prev_output () { return d_prev_output; }
+  o_type prev_output () const { return d_prev_output; }
     
 protected:
   tap_type	d_alpha;
@@ -155,7 +155,7 @@ public:
     d_prev_output = 0;
   }
 
-  gr_complexd prev_output () { return d_prev_output; }
+  gr_complexd prev_output () const { return d_prev_output; }
     
 protected:
   double	d_alpha;
diff --git a/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.h b/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.h
index a29acd628..df6de93d5 100644
--- a/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.h
+++ b/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.h
@@ -44,6 +44,8 @@ class gr_quadrature_demod_cf : public gr_sync_block
   float		d_gain;
 
  public:
+  void set_gain(float gain) { d_gain = gain; }
+  float gain() const { return d_gain; }
 
   int work (int noutput_items,
 		 gr_vector_const_void_star &input_items,
diff --git a/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.i b/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.i
index fbd45dcf8..d9f338daa 100644
--- a/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.i
+++ b/gnuradio-core/src/lib/general/gr_quadrature_demod_cf.i
@@ -27,4 +27,8 @@ gr_quadrature_demod_cf_sptr gr_make_quadrature_demod_cf (float gain);
 class gr_quadrature_demod_cf : public gr_sync_block
 {
   gr_quadrature_demod_cf (float gain);
+
+public:
+  void set_gain(float gain) { d_gain = gain; }
+  float gain() const { return d_gain; }
 };