diff --git a/src/features/editor/index.js b/src/features/editor/index.js
index 156bae5..d6a2b71 100644
--- a/src/features/editor/index.js
+++ b/src/features/editor/index.js
@@ -1,17 +1,16 @@
 import Timbre from './Timbre';
 import Vocoder from './Vocoder';
 import Effects from './Effects';
-import Arpeggio from './Arpeggio';
 import { useSelector } from 'react-redux';
 
 export default function Editor() {
   const activeTab = useSelector((state) => state.parameters.activeTab);
   return (
-    <div className='col-span-5 overflow-y-auto overscroll-contain'>
-      {activeTab === 'Timbre1' ? <Timbre id='timbre1' /> : null}
-      {activeTab === 'Timbre2' ? <Timbre id='timbre2' /> : null}
-      {activeTab === 'Vocoder' ? <Vocoder id='vocoder' /> : null}
-      {activeTab === 'Effects' ? <Effects id='effects' /> : null}
+    <div className="col-span-5 overflow-y-auto overscroll-contain">
+      {activeTab === 'Timbre1' ? <Timbre id="timbre1" /> : null}
+      {activeTab === 'Timbre2' ? <Timbre id="timbre2" /> : null}
+      {activeTab === 'Vocoder' ? <Vocoder id="vocoder" /> : null}
+      {activeTab === 'Effects' ? <Effects id="effects" /> : null}
     </div>
   );
 }
diff --git a/src/features/io/convert/serialise.js b/src/features/io/convert/serialise.js
index fdc1eb8..c623426 100644
--- a/src/features/io/convert/serialise.js
+++ b/src/features/io/convert/serialise.js
@@ -1,17 +1,17 @@
 import { fromBitArray, buildByte } from '../utils/functions';
 
 export default function serialise(patch) {
-  const data = new Array.from(serialise_patch(patch[0]));
+  const data = Array.from(serialise_patch(patch[0]));
   switch (patch[0].voice_mode) {
     default:
     case 'Single':
-      data.append(serialise_timbre(1, patch[1]));
+      data.concat(serialise_timbre(1, patch[1]));
       break;
     case 'Multiple':
-      data.append(serialise_timbre(1, patch[1]), serialise_timbre(2, patch[2]));
+      data.concat(serialise_timbre(1, patch[1]), serialise_timbre(2, patch[2]));
       break;
     case 'Vocoder':
-      data.append(serialise_vocoder(patch[1]));
+      data.concat(serialise_vocoder(patch[1]));
       break;
   }
   return data;
@@ -155,7 +155,7 @@ function serialise_timbre(num, timbre) {
     ),
     timbre[`t${num}_patch_4_intensity`],
   ];
-  array.append(Array(55).fill(0));
+  array.concat(Array(55).fill(0));
   return array;
 }
 
@@ -242,6 +242,6 @@ function serialise_vocoder(vocoder) {
     vocoder.v_pan_7,
     vocoder.v_pan_8,
   ];
-  array.append(Array(174).fill(0));
+  array.concat(Array(174).fill(0));
   return array;
 }
diff --git a/src/features/io/utils/sysex.js b/src/features/io/utils/sysex.js
index 8c6efe9..26cb5ef 100644
--- a/src/features/io/utils/sysex.js
+++ b/src/features/io/utils/sysex.js
@@ -75,10 +75,10 @@ export function sysex_encode(data) {
 
 export function sysex_write_header(data, channel) {
   const ch = 0x30 + channel;
-  return new Uint8Array(5 + SYSEX_LENGTH + 1)
-    .set([0xf0, 0x42, ch, 0x58, 0x40], 0)
-    .set(data, 5)
-    .set(0xf7, -1);
+  const array = new Uint8Array(5 + SYSEX_LENGTH + 1);
+  array.set([0xf0, 0x42, ch, 0x58, 0x40], 0);
+  array.set([...data, 0xf7], 5);
+  return array;
 }
 
 export function sysex_decode(syx) {