diff --git a/filter/iir.c b/filter/iir.c
index 3a6c63b..18d7c5c 100644
--- a/filter/iir.c
+++ b/filter/iir.c
@@ -15,17 +15,24 @@ inline float apply_preemphasis(ResistorCapacitor *filter, float sample) {
 	return out;
 }
 
-void tilt_init(TiltCorrectionFilter* filter, float correction_strength) {
-    filter->tilt = correction_strength;
-    filter->prev_in = 0.0f;
-    filter->prev_out = 0.0f;
+void tilt_init(TiltCorrectionFilter* f, float correction_strength, float sr) {
+    float cutoff = 1000.0f; // fixed split point
+
+    // one-pole lowpass setup
+    float alpha = expf(-2.0f * (float)M_PI * cutoff / sr);
+    f->a1 = alpha;
+    f->a0 = 1.0f - alpha;
+    f->lp = 0.0f;
+
+    // simple low/high gains from tilt
+    float t = (tilt < -1.0f) ? -1.0f : (tilt > 1.0f ? 1.0f : tilt);
+    f->low_gain  = 1.0f - t;
+    f->high_gain = 1.0f + t;
 }
 
-float tilt(TiltCorrectionFilter* filter, float input) {
-    float out = input + filter->tilt * (input - filter->prev_in);
-
-    filter->prev_in = input;
-    filter->prev_out = out;
-
-    return out;
+float tilt(TiltCorrectionFilter* f, float in) {
+    // lowpass
+    f->lp = f->a0 * in + f->a1 * f->lp;
+    float hp = in - f->lp;
+    return f->lp * f->low_gain + hp * f->high_gain;
 }
\ No newline at end of file
diff --git a/filter/iir.h b/filter/iir.h
index 5d925f0..16283f3 100644
--- a/filter/iir.h
+++ b/filter/iir.h
@@ -14,10 +14,11 @@ void init_preemphasis(ResistorCapacitor *filter, float tau, float sample_rate, f
 float apply_preemphasis(ResistorCapacitor *filter, float sample);
 
 typedef struct {
-    float tilt;     // Tilt amount (-1.0 to +1.0 typical)
-    float prev_in;  // Previous input sample
-    float prev_out; // Previous output sample
+    float a0, a1;     // lowpass coeffs
+    float lp;         // lowpass state
+    float low_gain;   // gain for low frequencies
+    float high_gain;  // gain for high frequencies
 } TiltCorrectionFilter;
 
-void tilt_init(TiltCorrectionFilter* filter, float alpha);
-float tilt(TiltCorrectionFilter *filter, float input);
+void tilt_init(TiltCorrectionFilter* f, float correction_strength, float sr);
+float tilt(TiltCorrectionFilter *f, float in);
diff --git a/src/fm95.c b/src/fm95.c
index 998eda4..c08b563 100644
--- a/src/fm95.c
+++ b/src/fm95.c
@@ -439,7 +439,7 @@ int setup_audio(FM95_Runtime* runtime, const FM95_DeviceNames dv_names, const FM
 }
 
 void init_runtime(FM95_Runtime* runtime, const FM95_Config config) {
-	if(config.tilt != 0) tilt_init(&runtime->tilter, config.tilt);
+	if(config.tilt != 0) tilt_init(&runtime->tilter, config.tilt, config.sample_rate);
 	
 	if(config.calibration != 0) {
 		init_oscillator(&runtime->osc, (config.calibration == 2) ? 60 : 400, config.sample_rate);