diff --git a/Makefile b/Makefile
index feb05d6..50e1032 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,9 @@ CFLAGS += -Wno-format
 CFLAGS += -Wno-error=unused-function
 CFLAGS += -Wno-error=array-bounds
 CFLAGS += -Wno-unknown-pragmas
+ifneq '' '$(findstring clang++,$(CXX))'
 CFLAGS += -Wno-vla-cxx-extension
+endif
 CFLAGS += -fno-strict-aliasing
 CFLAGS += -I./include
 CFLAGS += -I./data
@@ -43,7 +45,7 @@ LDFLAGS += -lm
 #LDFLAGS += -Wl,--gc-sections
 #-Wl,--print-gc-sections
 ifeq ($(UNAME),Linux)
-#LDFLAGS += -Wl,-z noexecstack
+LDFLAGS += -z noexecstack
 endif
 ifeq ($(UNAME),Darwin)
 LDFLAGS += -framework Foundation -framework Cocoa -framework IOKit -framework AVFoundation -framework CoreVideo -framework CoreAudio -framework CoreMedia -framework CoreHaptics -framework AudioToolbox -framework GameController -framework ForceFeedback -framework Carbon -framework Metal -framework QuartzCore -framework UniformTypeIdentifiers
@@ -114,9 +116,6 @@ endif
 
 all: main
 
-CC = clang
-CXX = clang++
-
 %.o: %.c
 	$(CC) $(ARCH) $(CSTD) $(CFLAGS) $(FLAGS) $(OPT) $(DEBUG) -c $< -o $@
 
diff --git a/include/audio.h b/include/audio.h
index dc5cb12..7afa9a8 100644
--- a/include/audio.h
+++ b/include/audio.h
@@ -7,88 +7,57 @@ namespace audio {
   constexpr int sample_rate = 48000;
   constexpr int channels = 2;
 
-  template <int maxDelay>
-  struct FeedbackCombFilter {
-  private:
-    //float * buffer;
-    float buffer[maxDelay];
-    int index;
-  public:
-    int delay;
-    float gain0;
-    float gainM;
-
-    FeedbackCombFilter(int delay, float gain0, float gainM);
-    void reset();
-    float feed(float value);
-  };
-
-  template <int maxDelay>
-  struct FeedforwardCombFilter {
-  private:
-    //float * buffer;
-    float buffer[maxDelay];
-    int index;
-  public:
-    int delay;
-    float gain0;
-    float gainM;
-
-    FeedforwardCombFilter(int delay, float gain0, float gainM);
-    void reset();
-    float feed(float value);
-  };
-
-  template <int maxDelay>
-  struct AllpassFilter {
-  private:
-    //float * buffer;
-    float buffer[maxDelay];
+  struct DelayFilter {
+    float * buffer;
     int index;
 
-  public:
+    const int maxDelay;
     int delay;
-    float gain0;
-    float gainM;
+    float gain;
+
+    DelayFilter(int maxDelay, int delay, float gain);
 
-    AllpassFilter(int delay, float gain0, float gainM);
     void reset();
-    float feed(float x);
+    virtual float feed(float value) = 0;
   };
 
-  using FBCF = FeedbackCombFilter<15000>;
-  using FFCF = FeedforwardCombFilter<15000>;
-  using AP = AllpassFilter<2500>;
+  struct FeedbackCombFilter : DelayFilter {
+    FeedbackCombFilter(int maxDelay, int delay, float gain);
+    float feed(float value) override;
+  };
+
+  struct FeedforwardCombFilter : DelayFilter {
+  public:
+    FeedforwardCombFilter(int maxDelay, int delay, float gain);
+    float feed(float value) override;
+  };
+
+  struct AllpassFilter : DelayFilter {
+    AllpassFilter(int maxDelay, int delay, float gain);
+    float feed(float x) override;
+  };
+
+  using FBCF = FeedbackCombFilter;
+  using FFCF = FeedforwardCombFilter;
+  using AP = AllpassFilter;
 
   struct lr { float l; float r; };
 
-  struct FBReverb {
+  struct Reverb {
+    static constexpr int apCount = 3;
     static constexpr int cfCount = 4;
-    static constexpr int apCount = 3;
 
-    FBCF cf[cfCount];
-    AP ap[apCount];
+    DelayFilter * cf;
+    DelayFilter * ap;
 
-    FBReverb();
-    void reset();
-    lr feed(float x);
-  };
-
-  struct FFReverb {
-    static constexpr int __cfCount = 4;
-    static constexpr int apCount = 3;
-
-    FFCF cf[__cfCount];
-    AP ap[apCount];
-
-    FFReverb();
+    Reverb(DelayFilter * cf, DelayFilter * ap);
     void reset();
     lr feed(float x);
   };
 
   extern int reverbIndex;
-  extern FBReverb fbreverb;
-  extern FFReverb ffreverb;
+  extern Reverb * reverbs[];
+  extern int const reverbsCount;
 
   extern float wetGain;
   extern float dryGain;
diff --git a/include/ui.h b/include/ui.h
index ed9e71b..a177380 100644
--- a/include/ui.h
+++ b/include/ui.h
@@ -4,6 +4,7 @@
 
 namespace ui
 {
+  void init();
   void draw(MappedInstanceData<SolidInstance> & data,
             MappedInstanceData<font::BitmapInstance> & fontData);
   void update(float mx, float my, bool mLeft, bool mEdge);
diff --git a/include/ui/widget.h b/include/ui/widget.h
index 0d5bd77..d02a117 100644
--- a/include/ui/widget.h
+++ b/include/ui/widget.h
@@ -86,6 +86,9 @@ namespace ui::widget
     T maxExtent;
     T * value;
 
+    Slider()
+    {}
+
     Slider(char const * label,
            int left, int top, int width, int height,
            T minValue, T maxValue,
@@ -117,30 +120,27 @@ namespace ui::widget
     char const * label;
 
     Slider<int, true> delay;
-    Slider<float, true> gain0;
-    Slider<float, true> gainM;
+    Slider<float, true> gain;
+
+    DelayGainSlider()
+    {}
 
     DelayGainSlider(char const * label,
                     int left, int top,
                     int delayMin, int delayMax, int * delayValue,
                     float gainMin, float gainMax,
-                    float * gain0Value, float * gainMValue)
+                    float * gainValue)
       : label(label)
       , delay("delay",
               left, top, 150, 14,
               delayMin, delayMax,
               delayMin, delayMax,
               delayValue)
-      , gain0("gain0",
-              left, top + 30, 150, 14,
-              gainMin, gainMax,
-              gainMin, gainMax,
-              gain0Value)
-      , gainM("gainM",
-              left, top + 60, 150, 14,
-              gainMin, gainMax,
-              gainMin, gainMax,
-              gainMValue)
+      , gain("gain",
+             left, top + 30, 150, 14,
+             gainMin, gainMax,
+             gainMin, gainMax,
+             gainValue)
     {}
 
     void draw(MappedInstanceData<SolidInstance> & data,
diff --git a/src/audio.cpp b/src/audio.cpp
index bb53fa2..2fb1610 100644
--- a/src/audio.cpp
+++ b/src/audio.cpp
@@ -13,14 +13,14 @@
 #include "poem.h"
 
 namespace audio {
-  static int const frame_samples = 960; // 20 milliseconds @ 48kHz
+  //static int const frame_samples = 960; // 20 milliseconds @ 48kHz
   static int const sample_size = (sizeof (int16_t));
 
   static int const max_frame_size = 960 * 3; // 20ms at 48kHz
-  static int const max_packet_size = 1275;
+  //static int const max_packet_size = 1275;
 
   static int const half_period_samples = sample_rate / 30;
-  static int const half_period_size = half_period_samples * sample_size * channels;
+  //static int const half_period_size = half_period_samples * sample_size * channels;
 
   struct AudioBuffer {
     renpy::language::audio const * audio;
@@ -28,111 +28,87 @@ namespace audio {
     uint32_t sample_count;
   };
 
-  template <int maxDelay>
-  FeedbackCombFilter<maxDelay>::FeedbackCombFilter(int delay, float gain0, float gainM)
-    : delay(delay), gain0(gain0), gainM(gainM)
+  //////////////////////////////////////////////////////////////////////
+  // DelayFilter
+  //////////////////////////////////////////////////////////////////////
+
+  void DelayFilter::reset()
   {
-    //buffer = (float *)malloc((sizeof (float)) * maxDelay);
+    memset(buffer, 0, maxDelay * (sizeof (float)));
+  }
+
+  DelayFilter::DelayFilter(int maxDelay, int delay, float gain)
+    : index(0)
+    , maxDelay(maxDelay)
+    , delay(delay)
+    , gain(gain)
+  {
+    buffer = (float *)malloc(maxDelay * (sizeof (float)));
     reset();
   }
 
-  template <int maxDelay>
-  void FeedbackCombFilter<maxDelay>::reset()
-  {
-    index = 0;
-    memset(buffer, 0, (sizeof (float)) * maxDelay);
-  }
+  //////////////////////////////////////////////////////////////////////
+  // FeedbackCombFilter
+  //////////////////////////////////////////////////////////////////////
 
-  template <int maxDelay>
-  float FeedbackCombFilter<maxDelay>::feed(float value)
+  FeedbackCombFilter::FeedbackCombFilter(int maxDelay, int delay, float gain)
+    : DelayFilter(maxDelay, delay, gain)
+  {}
+
+  float FeedbackCombFilter::feed(float value)
   {
-    float y = gain0 * value + gainM * buffer[index];
+    float y = gain * value + gain * buffer[index];
     buffer[index] = y;
     index = (index + 1) % delay;
     return y;
   }
 
-  template <int maxDelay>
-  FeedforwardCombFilter<maxDelay>::FeedforwardCombFilter(int delay, float gain0, float gainM)
-    : delay(delay), gain0(gain0), gainM(gainM)
-  {
-    //buffer = (float *)malloc((sizeof (float)) * maxDelay);
-    reset();
-  }
+  //////////////////////////////////////////////////////////////////////
+  // FeedForwardCombFilter
+  //////////////////////////////////////////////////////////////////////
 
-  template <int maxDelay>
-  void FeedforwardCombFilter<maxDelay>::reset()
-  {
-    index = 0;
-    memset(buffer, 0, (sizeof (float)) * maxDelay);
-  }
+  FeedforwardCombFilter::FeedforwardCombFilter(int maxDelay, int delay, float gain)
+    : DelayFilter(maxDelay, delay, gain)
+  {}
 
-  template <int maxDelay>
-  float FeedforwardCombFilter<maxDelay>::feed(float value)
+  float FeedforwardCombFilter::feed(float value)
   {
-    float y = gain0 * value + gainM * buffer[index];
+    float y = gain * value + gain * buffer[index];
     buffer[index] = value;
     index = (index + 1) % delay;
     return y;
   }
 
-  template <int maxDelay>
-  AllpassFilter<maxDelay>::AllpassFilter(int delay, float gain0, float gainM)
-    : delay(delay), gain0(gain0), gainM(gainM)
-  {
-    //buffer = (float *)malloc((sizeof (float)) * maxDelay);
-    reset();
-  }
+  //////////////////////////////////////////////////////////////////////
+  // AllpassFilter
+  //////////////////////////////////////////////////////////////////////
 
-  template <int maxDelay>
-  void AllpassFilter<maxDelay>::reset()
-  {
-    index = 0;
-    memset(buffer, 0, (sizeof (float)) * maxDelay);
-  }
+  AllpassFilter::AllpassFilter(int maxDelay, int delay, float gain)
+    : DelayFilter(maxDelay, delay, gain)
+  {}
 
-  template <int maxDelay>
-  float AllpassFilter<maxDelay>::feed(float x)
+  float AllpassFilter::feed(float x)
   {
-    float v = x + -gainM * buffer[index];
-    float y = buffer[index] + gain0 * v;
+    float v = x + -gain * buffer[index];
+    float y = buffer[index] + gain * v;
     buffer[index] = v;
     index = (index + 1) % delay;
     return y;
   }
 
-  struct AudioInstance {
-    int audio_index;
-    AudioBuffer * audio_buffer;
-    uint32_t sample_index;
-    uint32_t tail_index;
-    uint32_t fadeout_end;
-    uint32_t fadeout_index;
-    poem::poem const * poem;
-  };
+  //////////////////////////////////////////////////////////////////////
+  // Reverberators
+  //////////////////////////////////////////////////////////////////////
 
-  FBReverb::FBReverb()
-    : cf{FBCF(3229, 1.0f, 0.733f), // 1687
-         FBCF(3079, 1.0f, 0.802f), // 1601
-         FBCF(3943, 1.0f, 0.753f), // 2053
-         FBCF(4327, 1.0f, 0.733f), // 2251
-      }
-    , ap{AP(661, 0.7f, 0.7f), // 347
-         AP(257, 0.7f, 0.7f), // 113
-         AP(71, 0.7f, 0.7f), // 37
-      }
-  { }
-
-  void FBReverb::reset()
+  void Reverb::reset()
   {
     for (int i = 0; i < cfCount; i++)
       cf[i].reset();
-
     for (int i = 0; i < apCount; i++)
       ap[i].reset();
   }
 
-  lr FBReverb::feed(float x)
+  lr Reverb::feed(float x)
   {
     for (int i = 0; i < apCount; i++) {
       x = ap[i].feed(x);
@@ -151,54 +127,54 @@ namespace audio {
     return {a, b};
   }
 
+  Reverb::Reverb(DelayFilter * cf, DelayFilter * ap)
+    : cf(cf), ap(ap)
+  {}
 
-  FFReverb::FFReverb()
-    : cf{FFCF{9209, 1.0f, 0.742f},
-         FFCF{9601, 1.0f, 0.733f},
-         FFCF{10369, 1.0f, 0.715f},
-         FFCF{11131, 1.0f, 0.697f},
-      }
-    , ap{AP{2017, 0.7f, 0.7f},
-         AP{647, 0.7f, 0.7f},
-         AP{137, 0.7f, 0.7f},
-      }
-  { }
+  static FFCF forwardCF[4]{FFCF{15000, 9209, 0.742f},
+                           FFCF{15000, 9601, 0.733f},
+                           FFCF{15000, 10369, 0.715f},
+                           FFCF{15000, 11131, 0.697f}};
 
-  void FFReverb::reset()
-  {
-    for (int i = 0; i < __cfCount; i++) {
-      printf("reset cf %d\n", i);
-      cf[i].reset();
-    }
+  static AP forwardAP[3]{AP{2500, 2017, 0.7f},
+                         AP{2500, 647, 0.7f},
+                         AP{2500, 137, 0.7f}};
+  Reverb forwardReverb(forwardCF, forwardAP);
 
-    for (int i = 0; i < apCount; i++)
-      ap[i].reset();
-  }
-
-  lr FFReverb::feed(float x)
-  {
-    for (int i = 0; i < apCount; i++) {
-      x = ap[i].feed(x);
-    }
-
-    float x0 = cf[0].feed(x);
-    float x1 = cf[1].feed(x);
-    float x2 = cf[2].feed(x);
-    float x3 = cf[3].feed(x);
-
-    float s0 = x0 + x1 + x2 + x3;
-    //float s0 = x0 + x1 + x2;
-    return {s0, s0};
-  }
+  static FBCF backCF[4]{FBCF{10000, 3229, 0.733f},  // 1687
+                        FBCF{10000, 3079, 0.802f},  // 1601
+                        FBCF{10000, 3943, 0.753f},  // 2053
+                        FBCF{10000, 4327, 0.733f}}; // 2251
+  static AP backAP[3]{AP{1500, 661, 0.7f}, // 347
+                      AP{1500, 257, 0.7f}, // 113
+                      AP{1500, 71, 0.7f}};
+  Reverb backReverb(backCF, backAP);
 
   int reverbIndex = 0;
-  FBReverb fbreverb;
-  FFReverb ffreverb;
+  Reverb * reverbs[] = {
+    &backReverb,
+    &forwardReverb,
+  };
+  int const reverbsCount = (sizeof (reverbs)) / (sizeof (reverbs[0]));
 
   float dryGain = 1.0;
   float wetGain = 0.25;
   float mixChannelGain[mixChannelCount];
 
+  //////////////////////////////////////////////////////////////////////
+  // AudioInstance
+  //////////////////////////////////////////////////////////////////////
+
+  struct AudioInstance {
+    int audio_index;
+    AudioBuffer * audio_buffer;
+    uint32_t sample_index;
+    uint32_t tail_index;
+    uint32_t fadeout_end;
+    uint32_t fadeout_index;
+    poem::poem const * poem;
+  };
+
   //
 
   static SDL_AudioStream * audio_stream;
@@ -221,8 +197,8 @@ namespace audio {
     SDL_ResumeAudioStreamDevice(audio_stream);
 
     audio_instances_count = 0;
-    fbreverb.reset();
-    ffreverb.reset();
+    for (int i = 0; i < reverbsCount; i++)
+      reverbs[i]->reset();
 
     for (int i = 0; i < mixChannelCount; i++) {
       mixChannelGain[i] = 1.0f;
@@ -566,12 +542,8 @@ namespace audio {
       float value = channel_buffer[mix_channel::voice][i * channels + 0];
 
       lr wet;
-      if (reverbIndex == 0) {
-        wet = fbreverb.feed(value);
-      }
-      else {
-        wet = ffreverb.feed(value);
-      }
+      assert(reverbIndex >= 0 && reverbIndex < reverbsCount);
+      wet = reverbs[reverbIndex]->feed(value);
       float left = value * dryGain + wet.l * wetGain;
       float right = value * dryGain + wet.r * wetGain;
       channel_buffer[mix_channel::voice][i * channels + 0] = left;
diff --git a/src/main.cpp b/src/main.cpp
index d208d5b..2d302e3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1000,6 +1000,12 @@ int main()
   // 2.17
   printf("audio_time %f\n", audio_time);
 
+  //////////////////////////////////////////////////////////////////////
+  // ui
+  //////////////////////////////////////////////////////////////////////
+
+  ui::init();
+
   //////////////////////////////////////////////////////////////////////
   // interpreter
   //////////////////////////////////////////////////////////////////////
diff --git a/src/ui.cpp b/src/ui.cpp
index 3dc980f..6b5972b 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -12,76 +12,13 @@ namespace ui
   constexpr int combLeft = 700;
   constexpr int outputMixLeft = 1000;
 
-#define BREVERB audio::fbreverb
-#define FREVERB audio::ffreverb
 
-  widget::DelayGainSlider fap[3] {
-    widget::DelayGainSlider("allpass 0",
-                            allpassLeft, top + ySpace * 0,
-                            1, 2500, &FREVERB.ap[0].delay,
-                            0.0, 1.0, &FREVERB.ap[0].gain0, &FREVERB.ap[0].gainM),
-    widget::DelayGainSlider("allpass 1",
-                            allpassLeft, top + ySpace * 1,
-                            1, 2500, &FREVERB.ap[1].delay,
-                            0.0, 1.0, &FREVERB.ap[1].gain0, &FREVERB.ap[1].gainM),
-    widget::DelayGainSlider("allpass 2",
-                            allpassLeft, top + ySpace * 2,
-                            1, 2500, &FREVERB.ap[2].delay,
-                            0.0, 1.0, &FREVERB.ap[2].gain0, &FREVERB.ap[2].gainM),
+  struct ap_comb {
+    widget::DelayGainSlider ap[3];
+    widget::DelayGainSlider comb[4];
   };
 
-  widget::DelayGainSlider fcomb[4] {
-    widget::DelayGainSlider("comb 0",
-                            combLeft, top + ySpace * 0,
-                            100, 15000, &FREVERB.cf[0].delay,
-                            0.0, 1.0, &FREVERB.cf[0].gain0, &FREVERB.cf[0].gainM),
-    widget::DelayGainSlider("comb 1",
-                            combLeft, top + ySpace * 1,
-                            100, 15000, &FREVERB.cf[1].delay,
-                            0.0, 1.0, &FREVERB.cf[1].gain0, &FREVERB.cf[1].gainM),
-    widget::DelayGainSlider("comb 2",
-                            combLeft, top + ySpace * 2,
-                            100, 15000, &FREVERB.cf[2].delay,
-                            0.0, 1.0, &FREVERB.cf[2].gain0, &FREVERB.cf[2].gainM),
-    widget::DelayGainSlider("comb 3",
-                            combLeft, top + ySpace * 3,
-                            100, 15000, &FREVERB.cf[3].delay,
-                            0.0, 1.0, &FREVERB.cf[3].gain0, &FREVERB.cf[3].gainM),
-  };
-
-  widget::DelayGainSlider bap[3] {
-    widget::DelayGainSlider("allpass 0",
-                            allpassLeft, top + ySpace * 0,
-                            1, 2500, &BREVERB.ap[0].delay,
-                            0.0, 1.0, &BREVERB.ap[0].gain0, &BREVERB.ap[0].gainM),
-    widget::DelayGainSlider("allpass 1",
-                            allpassLeft, top + ySpace * 1,
-                            1, 2500, &BREVERB.ap[1].delay,
-                            0.0, 1.0, &BREVERB.ap[1].gain0, &BREVERB.ap[1].gainM),
-    widget::DelayGainSlider("allpass 2",
-                            allpassLeft, top + ySpace * 2,
-                            1, 2500, &BREVERB.ap[2].delay,
-                            0.0, 1.0, &BREVERB.ap[2].gain0, &BREVERB.ap[2].gainM),
-  };
-
-  widget::DelayGainSlider bcomb[4] {
-    widget::DelayGainSlider("comb 0",
-                            combLeft, top + ySpace * 0,
-                            100, 15000, &BREVERB.cf[0].delay,
-                            0.0, 1.0, &BREVERB.cf[0].gain0, &BREVERB.cf[0].gainM),
-    widget::DelayGainSlider("comb 1",
-                            combLeft, top + ySpace * 1,
-                            100, 15000, &BREVERB.cf[1].delay,
-                            0.0, 1.0, &BREVERB.cf[1].gain0, &BREVERB.cf[1].gainM),
-    widget::DelayGainSlider("comb 2",
-                            combLeft, top + ySpace * 2,
-                            100, 15000, &BREVERB.cf[2].delay,
-                            0.0, 1.0, &BREVERB.cf[2].gain0, &BREVERB.cf[2].gainM),
-    widget::DelayGainSlider("comb 3",
-                            combLeft, top + ySpace * 3,
-                            100, 15000, &BREVERB.cf[3].delay,
-                            0.0, 1.0, &BREVERB.cf[3].gain0, &BREVERB.cf[3].gainM),
-  };
+  ap_comb reverberatorSliders[2];
 
   widget::Slider<float, false> dryGain("dry gain",
                                        outputMixLeft, top + yMixSpace * 0, 150, 14,
@@ -118,6 +55,38 @@ namespace ui
                                  120, 0,
                                  &audio::reverbIndex);
 
+  void init()
+  {
+    static const char * allpassLabels[3] = {
+      "allpass 0",
+      "allpass 1",
+      "allpass 2",
+    };
+    static const char * combLabels[4] = {
+      "comb 0",
+      "comb 1",
+      "comb 2",
+      "comb 3",
+    };
+
+    for (int i = 0; i < 2; i++) {
+      for (int j = 0; j < 3; j++) {
+        reverberatorSliders[i].ap[j] =
+          widget::DelayGainSlider(allpassLabels[j],
+                                  allpassLeft, top + ySpace * j,
+                                  1, audio::reverbs[i]->ap[j].maxDelay, &audio::reverbs[i]->ap[j].delay,
+                                  0.0, 1.0, &audio::reverbs[i]->ap[j].gain);
+      }
+      for (int j = 0; j < 4; j++) {
+        reverberatorSliders[i].comb[j] =
+          widget::DelayGainSlider(combLabels[j],
+                                  combLeft, top + ySpace * j,
+                                  100, audio::reverbs[i]->cf[j].maxDelay, &audio::reverbs[i]->cf[j].delay,
+                                  0.0, 1.0, &audio::reverbs[i]->cf[j].gain);
+      }
+    }
+  }
+
   void draw(MappedInstanceData<SolidInstance> & data,
             MappedInstanceData<font::BitmapInstance> & fontData)
   {
@@ -127,8 +96,8 @@ namespace ui
         0x80000000,
       });
 
-    widget::DelayGainSlider * ap = (audio::reverbIndex == 0) ? bap : fap;
-    widget::DelayGainSlider * comb = (audio::reverbIndex == 0) ? bcomb : fcomb;
+    widget::DelayGainSlider * ap = reverberatorSliders[audio::reverbIndex].ap;
+    widget::DelayGainSlider * comb = reverberatorSliders[audio::reverbIndex].comb;
 
     for (int i = 0; i < 3; i++)
       ap[i].draw(data, fontData);
@@ -148,8 +117,8 @@ namespace ui
 
   void update(float mx, float my, bool mLeft, bool mEdge)
   {
-    widget::DelayGainSlider * ap = (audio::reverbIndex == 0) ? bap : fap;
-    widget::DelayGainSlider * comb = (audio::reverbIndex == 0) ? bcomb : fcomb;
+    widget::DelayGainSlider * ap = reverberatorSliders[audio::reverbIndex].ap;
+    widget::DelayGainSlider * comb = reverberatorSliders[audio::reverbIndex].comb;
 
     for (int i = 0; i < 3; i++)
       ap[i].update(mx, my, mLeft, mEdge);
diff --git a/src/ui/widget.cpp b/src/ui/widget.cpp
index e527627..45222da 100644
--- a/src/ui/widget.cpp
+++ b/src/ui/widget.cpp
@@ -179,15 +179,13 @@ namespace ui::widget
     drawStringCentered(fontData, delay.slider.left + delay.slider.width / 2, delay.slider.top - 16, label);
 
     delay.draw(data, fontData);
-    gain0.draw(data, fontData);
-    gainM.draw(data, fontData);
+    gain.draw(data, fontData);
   }
 
   void DelayGainSlider::update(float mx, float my, bool mLeft, bool mEdge)
   {
     delay.update(mx, my, mLeft, mEdge);
-    gain0.update(mx, my, mLeft, mEdge);
-    gainM.update(mx, my, mLeft, mEdge);
+    gain.update(mx, my, mLeft, mEdge);
   }
 
   template <int optionCount>