diff --git a/MicroDexed.ino b/MicroDexed.ino
index a23cbfb..2343f28 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -218,6 +218,7 @@ char sd_string[LCD_cols + 1];
 char g_voice_name[NUM_DEXED][VOICE_NAME_LEN];
 char g_bank_name[NUM_DEXED][BANK_NAME_LEN];
 char receive_bank_filename[FILENAME_LEN];
+const float _pseudo_log = 1048575 / (float)(1 << 20);
 
 #if defined(USE_FX)
 // Allocate the delay lines for chorus
@@ -1399,10 +1400,10 @@ void initial_values_from_eeprom(bool init)
     Serial.println(F("OK, loaded!"));
 #endif
 
-    master_mixer_r.gain(DEXED, 1.0);
-    master_mixer_l.gain(DEXED, 1.0);
-    master_mixer_r.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
-    master_mixer_l.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
+    master_mixer_r.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_l.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_r.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_l.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
     master_mixer_r.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
     master_mixer_l.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
     master_mixer_r.gain(REVERB, mapfloat(configuration.fx.reverb_level, REVERB_LEVEL_MIN, REVERB_LEVEL_MAX, 0.0, 1.0));
@@ -1483,8 +1484,10 @@ void check_configuration(void)
     configuration.dexed[instance_id].op_enabled = constrain(configuration.dexed[instance_id].op_enabled, OP_ENABLED_MIN, OP_ENABLED_MAX);
   }
 
-  master_mixer_r.gain(CHORUS, mapfloat(configuration.fx.delay_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
-  master_mixer_l.gain(CHORUS, mapfloat(configuration.fx.delay_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
+  master_mixer_r.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_l.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_r.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_l.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
   master_mixer_r.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
   master_mixer_l.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
   master_mixer_r.gain(REVERB, mapfloat(configuration.fx.delay_level, REVERB_LEVEL_MIN, REVERB_LEVEL_MAX, 0.0, 1.0));
@@ -1690,8 +1693,10 @@ bool eeprom_get_performance()
 
 void set_fx_params(void)
 {
-  master_mixer_r.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
-  master_mixer_l.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
+  master_mixer_r.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_l.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_r.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+  master_mixer_l.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
   master_mixer_r.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
   master_mixer_l.gain(DELAY, mapfloat(configuration.fx.delay_level, DELAY_LEVEL_MIN, DELAY_LEVEL_MAX, 0.0, 1.0));
   master_mixer_r.gain(REVERB, mapfloat(configuration.fx.reverb_level, REVERB_LEVEL_MIN, REVERB_LEVEL_MAX, 0.0, 1.0));
diff --git a/UI.hpp b/UI.hpp
index 917b3e6..90ef2ac 100644
--- a/UI.hpp
+++ b/UI.hpp
@@ -90,6 +90,7 @@ extern char sd_string[LCD_cols + 1];
 extern char g_voice_name[NUM_DEXED][VOICE_NAME_LEN];
 extern char g_bank_name[NUM_DEXED][BANK_NAME_LEN];
 extern char receive_bank_filename[FILENAME_LEN];
+extern const float _pseudo_log;
 
 /***********************************************************************
    GLOBAL
@@ -1190,8 +1191,11 @@ void UI_func_chorus_level(uint8_t param)
 
     lcd_display_bar_int("Chorus Lvl.", configuration.fx.chorus_level, 1.0, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 3, false, false, false, false);
 
-    master_mixer_r.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
-    master_mixer_l.gain(CHORUS, mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 1.0));
+    master_mixer_r.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_l.gain(DEXED, _pseudo_log * arm_sin_f32(1.0 - mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_r.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+    master_mixer_l.gain(CHORUS, _pseudo_log * arm_cos_f32(mapfloat(configuration.fx.chorus_level, CHORUS_LEVEL_MIN, CHORUS_LEVEL_MAX, 0.0, 0.5)));
+
   }
 
   if (LCDML.FUNC_close())     // ****** STABLE END *********
diff --git a/config.h b/config.h
index a954b30..70a5f57 100644
--- a/config.h
+++ b/config.h
@@ -43,7 +43,7 @@
 // Tools for testing MIDI:  https://github.com/gbevin/SendMIDI
 //                          https://github.com/gbevin/ReceiveMIDI
 
-#define VERSION "0.9.9a"
+#define VERSION "0.9.9b"
 
 //*************************************************************************************************
 //* DEVICE SETTINGS
@@ -80,7 +80,7 @@
 //*************************************************************************************************
 //* DEBUG OUTPUT SETTINGS
 //*************************************************************************************************
-#define DEBUG 1
+//#define DEBUG 1
 #define SERIAL_SPEED 230400
 #define SHOW_XRUN 1
 #define SHOW_CPU_LOAD_MSEC 5000