tilt correction? (yes, ai wrote it, you hate me because of that? find a tilt filter yourself then that you can copy the code of)

filter/iir.h

@@ -12,3 +12,14 @@ typedef struct
 
 void init_preemphasis(ResistorCapacitor *filter, float tau, float sample_rate, float ref_freq);
 float apply_preemphasis(ResistorCapacitor *filter, float sample);
+
+typedef struct {
+    float b0, b1;
+    float a1;
+
+    float x_prev;
+    float y_prev;
+} TiltCorrectionFilter;
+
+void tilt_init(TiltCorrectionFilter *filter, float correction_strength);
+float tilt(TiltCorrectionFilter *filter, float input_sample);