diff --git a/include/dsd.h b/include/dsd.h
index 9f8a489..043c4d4 100644
--- a/include/dsd.h
+++ b/include/dsd.h
@@ -663,9 +663,8 @@ typedef struct
   //new audio filter structs
   LPFilter RCFilter;
   HPFilter HRCFilter;
-  LPFilter RCFilter8;
-  HPFilter HRCFilter8;
-  // PBFilter PBF;
+  PBFilter PBF;
+  NOTCHFilter NF;
   LPFilter RCFilterL;
   HPFilter HRCFilterL;
   LPFilter RCFilterR;
@@ -1331,8 +1330,8 @@ long int raw_rms(short *samples, int len, int step);
 void init_audio_filters(dsd_state * state);
 void lpf(dsd_state * state, short * input, int len);
 void hpf(dsd_state * state, short * input, int len);
-void lpf8(dsd_state * state, short * input, int len);
-void hpf8(dsd_state * state, short * input, int len);
+void pbf(dsd_state * state, short * input, int len);
+void nf(dsd_state * state, short * input, int len);
 //from: https://github.com/NedSimao/FilteringLibrary
 void LPFilter_Init(LPFilter *filter, float cutoffFreqHz, float sampleTimeS);
 float LPFilter_Update(LPFilter *filter, float v_in);
diff --git a/src/3.c b/src/3.c
index 1c4192b..4f3d907 100644
--- a/src/3.c
+++ b/src/3.c
@@ -464,10 +464,6 @@ void init_audio_filters (dsd_state * state)
   LPFilter_Init(&state->RCFilter, 960, (float)1/(float)48000);
   HPFilter_Init(&state->HRCFilter, 960, (float)1/(float)48000);
 
-	//still unsure if 8k sounds good or not (may be the walkie-talkie is too close to SDR, even outside)
-	LPFilter_Init(&state->RCFilter8, 160, (float)1/(float)8000);
-  HPFilter_Init(&state->HRCFilter8, 160, (float)1/(float)8000);
-
 	//left and right variants for stereo output testing on digital voice samples
   LPFilter_Init(&state->RCFilterL, 960, (float)1/(float)48000);
   HPFilter_Init(&state->HRCFilterL, 960, (float)1/(float)48000);
@@ -477,6 +473,9 @@ void init_audio_filters (dsd_state * state)
 	//PBFilter_Init(PBFilter *filter, float HPF_cutoffFreqHz, float LPF_cutoffFreqHz, float sampleTimeS);
 	// void NOTCHFilter_Init(NOTCHFilter *filter, float centerFreqHz, float notchWidthHz, float sampleTimeS);
 
+	//unclear what we should set up for these, output is super quiet after using them
+	PBFilter_Init(&state->PBF, 48000, 12000, (float)1/(float)48000);
+	NOTCHFilter_Init(&state->NF, 48000, 12000, (float)1/(float)48000);
 	
 }
 
@@ -487,7 +486,11 @@ void lpf(dsd_state * state, short * input, int len)
 {
   int i;
   for (i = 0; i < len; i++)
-    input[i] = LPFilter_Update(&state->RCFilter, input[i]);
+	{
+		// fprintf (stderr, "\n in: %05d", input[i]);
+		input[i] = LPFilter_Update(&state->RCFilter, input[i]);
+		// fprintf (stderr, "\n out: %05d", input[i]);
+	}
 }
 
 //hpf
@@ -495,23 +498,35 @@ void hpf(dsd_state * state, short * input, int len)
 {
   int i;
   for (i = 0; i < len; i++)
-    input[i] = HPFilter_Update(&state->HRCFilter, input[i]);
+	{
+		// fprintf (stderr, "\n in: %05d", input[i]);
+		input[i] = HPFilter_Update(&state->HRCFilter, input[i]);
+		// fprintf (stderr, "\n out: %05d", input[i]);
+	}
 }
 
-//lpf
-void lpf8(dsd_state * state, short * input, int len)
+//nf
+void nf(dsd_state * state, short * input, int len)
 {
   int i;
   for (i = 0; i < len; i++)
-    input[i] = LPFilter_Update(&state->RCFilter8, input[i]);
+	{
+		// fprintf (stderr, "\n in: %05d", input[i]);
+		input[i] = NOTCHFilter_Update(&state->NF, input[i]);
+		// fprintf (stderr, "\n out: %05d", input[i]);
+	}
 }
 
-//hpf
-void hpf8(dsd_state * state, short * input, int len)
+//pbf
+void pbf(dsd_state * state, short * input, int len)
 {
   int i;
   for (i = 0; i < len; i++)
-    input[i] = HPFilter_Update(&state->HRCFilter8, input[i]);
+	{
+		// fprintf (stderr, "\n in: %05d", input[i]);
+		input[i] = PBFilter_Update(&state->PBF, input[i]);
+		// fprintf (stderr, "\n out: %05d", input[i]);
+	}
 }
 
 //Generic RMS function derived from RTL_FM (RTL_SDR) RMS code (doesnt' really work correctly outside of RTL)