diff --git a/src/osp_types.hh b/src/osp_types.hh
deleted file mode 100644
index a50e086..0000000
--- a/src/osp_types.hh
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef HECK_OSP_TYPES_HH
-#define HECK_OSP_TYPES_HH
-
-#include "dizzy_types.hh"
-
-#endif
\ No newline at end of file
diff --git a/src/osp_utils.hh b/src/osp_utils.hh
index fe8469d..2b32d92 100644
--- a/src/osp_utils.hh
+++ b/src/osp_utils.hh
@@ -2,38 +2,8 @@
 #define HECK_OSP_UTILS_HH
 
 #include "daisy_seed.h"
-#include "osp_types.hh"
 #include "utils.hh"
 
-namespace Heck::OSP {
-    template<typename T> class Observer {
-
-    public:
-        bool on_change(T val_new, std::function<void(T val_current)> fn)
-        {
-            if (val_new != val_current_) {
-                val_current_ = val_new;
-                fn(val_current_);
-                return true;
-            }
-            return false;
-        }
-
-        bool on_change_fuzzy(T val_new, T min_deviation, std::function<void(T val_current)> fn)
-        {
-            if (std::abs(val_new - val_current_) >= min_deviation) {
-                val_current_ = val_new;
-                fn(val_current_);
-                return true;
-            }
-            return false;
-        }
-
-    private:
-        T val_current_{};
-    };
-} // namespace Heck::OSP
-
 namespace Heck::OSP {
     namespace Sig {
         struct Delta {
@@ -50,7 +20,8 @@ namespace Heck::OSP {
             float history[1];
         };
 
-        template<u32 SIZE> struct RingBuffer {
+        template<u32 SIZE>
+        struct RingBuffer {
             void init(float* buffer)
             {
                 buf_ = buffer;
@@ -83,7 +54,8 @@ namespace Heck::OSP {
             u32 size = SIZE;
         };
 
-        template<int SIZE> struct Delay101 {
+        template<int SIZE>
+        struct Delay101 {
             void init(Sig::RingBuffer<SIZE>* buff)
             {
                 buff_ = buff;