diff --git a/js/actionCreators/equalizer.js b/js/actionCreators/equalizer.ts
similarity index 54%
rename from js/actionCreators/equalizer.js
rename to js/actionCreators/equalizer.ts
index af1df716..fb4b8988 100644
--- a/js/actionCreators/equalizer.js
+++ b/js/actionCreators/equalizer.ts
@@ -1,10 +1,11 @@
 import { BANDS } from "../constants";
 
 import { SET_EQ_ON, SET_EQ_OFF, SET_BAND_VALUE } from "../actionTypes";
+import { Band, Dispatchable } from "../types";
 
 const BAND_SNAP_DISTANCE = 10;
 const BAND_MID_POINT_VALUE = 50;
-export function setEqBand(band, value) {
+export function setEqBand(band: Band, value: number): Dispatchable {
   if (
     value < BAND_MID_POINT_VALUE + BAND_SNAP_DISTANCE &&
     value > BAND_MID_POINT_VALUE - BAND_SNAP_DISTANCE
@@ -14,37 +15,40 @@ export function setEqBand(band, value) {
   return { type: SET_BAND_VALUE, band, value };
 }
 
-function _setEqTo(value) {
+function _setEqTo(value: number): Dispatchable {
   return dispatch => {
-    Object.keys(BANDS).forEach(key => {
+    Object.values(BANDS).forEach(band => {
       dispatch({
         type: SET_BAND_VALUE,
         value,
-        band: BANDS[key]
+        band: band
       });
     });
   };
 }
 
-export function setEqToMax() {
+export function setEqToMax(): Dispatchable {
   return _setEqTo(100);
 }
 
-export function setEqToMid() {
+export function setEqToMid(): Dispatchable {
   return _setEqTo(50);
 }
 
-export function setEqToMin() {
+export function setEqToMin(): Dispatchable {
   return _setEqTo(0);
 }
 
-export function setPreamp(value) {
+export function setPreamp(value: number): Dispatchable {
   return { type: SET_BAND_VALUE, band: "preamp", value };
 }
 
-export function toggleEq() {
+export function toggleEq(): Dispatchable {
   return (dispatch, getState) => {
-    const type = getState().equalizer.on ? SET_EQ_OFF : SET_EQ_ON;
-    dispatch({ type });
+    if (getState().equalizer.on) {
+      dispatch({ type: SET_EQ_OFF });
+    } else {
+      dispatch({ type: SET_EQ_ON });
+    }
   };
 }