add decay to CJ mod | 450

this functions but accomplishes basically nothing at the moment, just adding utility. it only functions when going from dense chordjacks to complete lack of any chords, essentially - and becomes effectively useless if an interval becomes empty

src/Etterna/MinaCalc/Agnostic/HA_PatternMods/CJ.h

@@ -29,6 +29,7 @@ struct CJMod
 	float not_jack_scaler = 1.75F;
 
 	float vibro_flag = 1.F;
+	float decay_factor = 0.1F;
 
 	const std::vector<std::pair<std::string, float*>> _params{
 		{ "min_mod", &min_mod },
@@ -51,6 +52,7 @@ struct CJMod
 		{ "not_jack_scaler", &not_jack_scaler },
 
 		{ "vibro_flag", &vibro_flag },
+		{ "decay_factor", &decay_factor },
 	};
 #pragma endregion params and param map
 
@@ -59,6 +61,13 @@ struct CJMod
 	float not_jack_prop = 0.F;
 	float pmod = min_mod;
 	float t_taps = 0.F;
+	float last_mod = 0.F;
+
+	void decay_mod()
+	{
+		pmod = std::clamp(last_mod - decay_factor, min_mod, max_mod);
+		last_mod = pmod;
+	}
 
 	// inline void set_dbg(std::vector<float> doot[], const int& i)
 	//{
@@ -76,7 +85,8 @@ struct CJMod
 
 		// no chords
 		if (itvi.chord_taps == 0) {
-			return min_mod;
+			decay_mod();
+			return pmod;
 		}
 
 		t_taps = static_cast<float>(itvi.total_taps);
@@ -124,6 +134,9 @@ struct CJMod
 			}
 		}
 
+		// set for decay
+		last_mod = pmod;
+
 		return pmod;
 	}
 };

src/Etterna/MinaCalc/MinaCalc.cpp

@@ -965,7 +965,7 @@ MinaSDCalcDebug(
 	}
 }
 
-int mina_calc_version = 449;
+int mina_calc_version = 450;
 auto
 GetCalcVersion() -> int
 {