diff --git a/src/store/middleware/audio.js b/src/store/middleware/audio.js
index db990c1..1d82bee 100644
--- a/src/store/middleware/audio.js
+++ b/src/store/middleware/audio.js
@@ -16,25 +16,26 @@ export default (store) => (next) => (action) => {
       case 'SELECT_COLOR': {
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
         oscillatorNode.detune.value = -600;
 
-        oscillatorNode.frequency.setValueAtTime(600, context.currentTime);
-        oscillatorNode.frequency.setValueAtTime(700, context.currentTime + 0.1);
+        oscillatorNode.frequency.setValueAtTime(600, currentTime);
+        oscillatorNode.frequency.setValueAtTime(700, currentTime + 0.1);
 
 
-        gainNode.gain.setValueAtTime(0.3, context.currentTime);
+        gainNode.gain.setValueAtTime(0.3, currentTime);
         gainNode.gain.exponentialRampToValueAtTime(
           0.2,
-          context.currentTime + 0.1,
+          currentTime + 0.1,
         );
 
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
 
         oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.2);
+        oscillatorNode.stop(currentTime + 0.2);
         break;
       }
 
@@ -45,85 +46,100 @@ export default (store) => (next) => (action) => {
         }
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
         oscillatorNode.detune.value = -1200;
 
-        oscillatorNode.frequency.setValueAtTime(500, context.currentTime);
-        oscillatorNode.frequency.setValueAtTime(600, context.currentTime + 0.1);
+        oscillatorNode.frequency.setValueAtTime(500, currentTime);
+        oscillatorNode.frequency.setValueAtTime(600, currentTime + 0.1);
 
-        gainNode.gain.setValueAtTime(0.3, context.currentTime);
+        gainNode.gain.setValueAtTime(0.3, currentTime);
         gainNode.gain.exponentialRampToValueAtTime(
           0.2,
-          context.currentTime + 0.1,
+          currentTime + 0.1,
         );
 
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
 
         oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.2);
+        oscillatorNode.stop(currentTime + 0.2);
         break;
       }
 
       case 'PIXEL_WAIT': {
+        /*
+         * TODO refactor other sounds also like this one
+         * i.e. gain sould ramp to 0, do oscillator first
+         */
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
-        // oscillatorNode.detune.value = -600
-
-        oscillatorNode.frequency.setValueAtTime(1479.98, context.currentTime);
+        oscillatorNode.start(currentTime);
+        oscillatorNode.frequency.setValueAtTime(1479.98, currentTime);
         oscillatorNode.frequency.exponentialRampToValueAtTime(
           493.88,
-          context.currentTime + 0.01,
+          currentTime + 0.01,
         );
-
-
-        gainNode.gain.setValueAtTime(0.5, context.currentTime);
-        gainNode.gain.exponentialRampToValueAtTime(
-          0.2,
-          context.currentTime + 0.1,
-        );
-
+        oscillatorNode.stop(currentTime + 0.1);
+        gainNode.gain.setValueAtTime(0.5, currentTime);
+        gainNode.gain.setTargetAtTime(0, currentTime, 0.1);
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
-
-        oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.1);
         break;
       }
 
       case 'ALERT': {
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
-        oscillatorNode.type = 'sine';
-        oscillatorNode.detune.value = -900;
-        oscillatorNode.frequency.setValueAtTime(600, context.currentTime);
-        oscillatorNode.frequency.setValueAtTime(
-          1400,
-          context.currentTime + 0.025,
-        );
-        oscillatorNode.frequency.setValueAtTime(
-          1200,
-          context.currentTime + 0.05,
-        );
-        oscillatorNode.frequency.setValueAtTime(
-          900,
-          context.currentTime + 0.075,
-        );
-
-        const lfo = context.createOscillator();
-        lfo.type = 'sine';
-        lfo.frequency.value = 2.0;
-        lfo.connect(gainNode.gain);
-        oscillatorNode.connect(gainNode);
-        gainNode.connect(context.destination);
-
-        oscillatorNode.start();
-        lfo.start();
-        oscillatorNode.stop(context.currentTime + 0.3);
+        if (action.alertType === 'captcha') {
+          oscillatorNode.type = 'sine';
+          oscillatorNode.detune.value = -600;
+          oscillatorNode.start(currentTime);
+          oscillatorNode.frequency.setValueAtTime(1479.98, currentTime);
+          oscillatorNode.frequency.exponentialRampToValueAtTime(
+            493.88,
+            currentTime + 0.01,
+          );
+          oscillatorNode.stop(currentTime + 0.1);
+          gainNode.gain.setValueAtTime(0.5, currentTime);
+          gainNode.gain.setTargetAtTime(0, currentTime, 0.1);
+          oscillatorNode.connect(gainNode);
+          gainNode.connect(context.destination);
+        } else {
+          oscillatorNode.type = 'sine';
+          oscillatorNode.detune.value = -900;
+          oscillatorNode.start(currentTime);
+          oscillatorNode.frequency.setValueAtTime(600, currentTime);
+          oscillatorNode.frequency.setValueAtTime(
+            1400,
+            currentTime + 0.025,
+          );
+          oscillatorNode.frequency.setValueAtTime(
+            1200,
+            currentTime + 0.05,
+          );
+          oscillatorNode.frequency.setValueAtTime(
+            900,
+            currentTime + 0.075,
+          );
+          oscillatorNode.stop(currentTime + 0.3);
+          const lfo = context.createOscillator();
+          lfo.type = 'sine';
+          lfo.start(currentTime);
+          lfo.frequency.setValueAtTime(2.0, currentTime);
+          lfo.stop(currentTime + 0.3);
+          lfo.connect(gainNode);
+          gainNode.gain.setValueAtTime(1.0, currentTime);
+          gainNode.gain.setTargetAtTime(0, currentTime, 3);
+          oscillatorNode.connect(gainNode);
+          gainNode.connect(context.destination);
+        }
         break;
       }
 
@@ -134,25 +150,26 @@ export default (store) => (next) => (action) => {
         const clrFreq = 100 + Math.log(color / colorsAmount + 1) * 300;
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
-        oscillatorNode.frequency.setValueAtTime(clrFreq, context.currentTime);
+        oscillatorNode.frequency.setValueAtTime(clrFreq, currentTime);
         oscillatorNode.frequency.exponentialRampToValueAtTime(
           1400,
-          context.currentTime + 0.2,
+          currentTime + 0.2,
         );
 
-        gainNode.gain.setValueAtTime(0.5, context.currentTime);
+        gainNode.gain.setValueAtTime(0.5, currentTime);
         gainNode.gain.exponentialRampToValueAtTime(
           0.2,
-          context.currentTime + 0.1,
+          currentTime + 0.1,
         );
 
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
 
         oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.1);
+        oscillatorNode.stop(currentTime + 0.1);
         break;
       }
 
@@ -165,29 +182,30 @@ export default (store) => (next) => (action) => {
 
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
-        oscillatorNode.frequency.setValueAtTime(349.23, context.currentTime);
+        oscillatorNode.frequency.setValueAtTime(349.23, currentTime);
         oscillatorNode.frequency.setValueAtTime(
           523.25,
-          context.currentTime + 0.1,
+          currentTime + 0.1,
         );
         oscillatorNode.frequency.setValueAtTime(
           698.46,
-          context.currentTime + 0.2,
+          currentTime + 0.2,
         );
 
-        gainNode.gain.setValueAtTime(0.5, context.currentTime);
+        gainNode.gain.setValueAtTime(0.5, currentTime);
         gainNode.gain.exponentialRampToValueAtTime(
           0.2,
-          context.currentTime + 0.15,
+          currentTime + 0.15,
         );
 
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
 
         oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.3);
+        oscillatorNode.stop(currentTime + 0.3);
         break;
       }
 
@@ -196,15 +214,17 @@ export default (store) => (next) => (action) => {
 
         const { isPing, channel } = action;
         const { mute: muteCh, chatChannel } = state.chatRead;
-        if (muteCh.includes(channel)) break;
-        if (muteCh.includes(`${channel}`)) break;
+        if (muteCh.includes(channel) || muteCh.includes(`${channel}`)) {
+          break;
+        }
         const { channels } = state.chat;
 
         const oscillatorNode = context.createOscillator();
         const gainNode = context.createGain();
+        const { currentTime } = context;
 
         oscillatorNode.type = 'sine';
-        oscillatorNode.frequency.setValueAtTime(310, context.currentTime);
+        oscillatorNode.frequency.setValueAtTime(310, currentTime);
         /*
          * ping if user mention or
          * message in DM channel that is not currently open
@@ -219,20 +239,20 @@ export default (store) => (next) => (action) => {
         ) ? 540 : 355;
         oscillatorNode.frequency.exponentialRampToValueAtTime(
           freq,
-          context.currentTime + 0.025,
+          currentTime + 0.025,
         );
 
-        gainNode.gain.setValueAtTime(0.1, context.currentTime);
+        gainNode.gain.setValueAtTime(0.1, currentTime);
         gainNode.gain.exponentialRampToValueAtTime(
           0.1,
-          context.currentTime + 0.1,
+          currentTime + 0.1,
         );
 
         oscillatorNode.connect(gainNode);
         gainNode.connect(context.destination);
 
         oscillatorNode.start();
-        oscillatorNode.stop(context.currentTime + 0.075);
+        oscillatorNode.stop(currentTime + 0.075);
         break;
       }