diff --git a/MicroDexed.ino b/MicroDexed.ino
index f244f92..68ccc15 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -2532,14 +2532,14 @@ void set_fx_params(void)
 
 #if NUM_DRUMS > 0
 #ifdef USE_FX
-  reverb_mixer_r.gain(2, 1.0); // Drums Reverb-Send
-  reverb_mixer_l.gain(2, 1.0); // Drums Reverb-Send
+  reverb_mixer_r.gain(REVERB_MIX_CH_DRUMS, 1.0); // Drums Reverb-Send
+  reverb_mixer_l.gain(REVERB_MIX_CH_DRUMS, 1.0); // Drums Reverb-Send
 #endif
 #endif
 
 #if defined(USE_EPIANO)
-  reverb_mixer_r.gain(3, 1.0); // EPiano Reverb-Send
-  reverb_mixer_l.gain(3, 1.0); // EPiano Reverb-Send
+  reverb_mixer_r.gain(REVERB_MIX_CH_EPIANO, mapfloat(configuration.fx.ep_reverb_send, EP_REVERB_SEND_MIN, EP_REVERB_SEND_MAX, 0.0, 1.0)); // EPiano Reverb-Send
+  reverb_mixer_l.gain(REVERB_MIX_CH_EPIANO, mapfloat(configuration.fx.ep_reverb_send, EP_REVERB_SEND_MIN, EP_REVERB_SEND_MAX, 0.0, 1.0)); // EPiano Reverb-Send
 
   // EP_CHORUS
   switch (configuration.fx.ep_chorus_waveform)