diff --git a/package.json b/package.json
index d8a3703..5c8230d 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "tone": "^14.8.49",
     "unique-names-generator": "^4.7.1",
     "vite-plugin-markdown": "^2.1.0",
-    "zifferjs": "^0.0.19",
+    "zifferjs": "^0.0.21",
     "zzfx": "^1.2.0"
   }
 }
diff --git a/src/API.ts b/src/API.ts
index 0e2d5ef..e366308 100644
--- a/src/API.ts
+++ b/src/API.ts
@@ -5,7 +5,7 @@ import { DrunkWalk } from "./Utils/Drunk";
 import { scale } from "./Scales";
 import { Editor } from "./main";
 import { SoundEvent } from "./classes/SoundEvent";
-import { NoteEvent } from "./classes/MidiEvent";
+import { MidiEvent } from "./classes/MidiEvent";
 import { LRUCache } from "lru-cache";
 import { InputOptions, Player } from "./classes/ZPlayer";
 import {
@@ -316,7 +316,7 @@ export class UserAPI {
     value: number | object = 60,
     velocity?: number,
     channel?: number
-  ): NoteEvent => {
+  ): MidiEvent => {
     /**
      * Sends a MIDI note to the current MIDI output.
      *
@@ -342,7 +342,7 @@ export class UserAPI {
       value["channel"] = channel;
     }
 
-    return new NoteEvent(value, this.app);
+    return new MidiEvent(value, this.app);
   };
 
   public sysex = (data: Array<number>): void => {
diff --git a/src/TransportNode.js b/src/TransportNode.js
index 0d3d1df..42c8a47 100644
--- a/src/TransportNode.js
+++ b/src/TransportNode.js
@@ -8,7 +8,7 @@ export class TransportNode extends AudioWorkletNode {
         this.app = application
         this.port.addEventListener("message", this.handleMessage);
         this.port.start();
-			  this.timeviewer = document.getElementById("timeviewer");
+		this.timeviewer = document.getElementById("timeviewer");
     }
 
     /** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
@@ -18,7 +18,7 @@ export class TransportNode extends AudioWorkletNode {
             this.app.clock.tick++
             const futureTimeStamp = this.app.clock.convertTicksToTimeposition(this.app.clock.tick);
             this.app.clock.time_position = futureTimeStamp;
-					  this.timeviewer.innerHTML = `${zeroPad(futureTimeStamp.bar, 2)}:${futureTimeStamp.beat+1}:${zeroPad(futureTimeStamp.pulse, 2)}`;
+			this.timeviewer.innerHTML = `${zeroPad(futureTimeStamp.bar, 2)}:${futureTimeStamp.beat+1}:${zeroPad(futureTimeStamp.pulse, 2)}`;
             
             if (this.app.exampleIsPlaying) {
                 tryEvaluate(this.app, this.app.example_buffer);
diff --git a/src/classes/MidiEvent.ts b/src/classes/MidiEvent.ts
index 76eef56..2321df0 100644
--- a/src/classes/MidiEvent.ts
+++ b/src/classes/MidiEvent.ts
@@ -3,7 +3,7 @@ import { type Editor } from "../main";
 import { MidiConnection } from "../IO/MidiConnection";
 import { midiToFreq, noteFromPc } from "zifferjs";
 
-export class NoteEvent extends AudibleEvent {
+export class MidiEvent extends AudibleEvent {
   midiConnection: MidiConnection;
 
   constructor(input: number | object, public app: Editor) {
@@ -13,6 +13,11 @@ export class NoteEvent extends AudibleEvent {
     this.midiConnection = app.api.MidiConnection;
   }
 
+  chord = (value: number[]): this => {
+    this.values["chord"] = value;
+    return this;
+  };
+  
   note = (value: number): this => {
     this.values["note"] = value;
     return this;
@@ -74,29 +79,40 @@ export class NoteEvent extends AudibleEvent {
   };
 
   out = (): void => {
-    const note = this.values.note ? this.values.note : 60;
-    const channel = this.values.channel ? this.values.channel : 0;
-    const velocity = this.values.velocity ? this.values.velocity : 100;
+    function play(note: number, event: MidiEvent): void {
+      const channel = event.values.channel ? event.values.channel : 0;
+      const velocity = event.values.velocity ? event.values.velocity : 100;
 
-    const sustain = this.values.sustain
-      ? this.values.sustain *
-        this.app.clock.pulse_duration *
-        this.app.api.ppqn()
-      : this.app.clock.pulse_duration * this.app.api.ppqn();
+      const sustain = event.values.sustain
+        ? event.values.sustain *
+          event.app.clock.pulse_duration *
+          event.app.api.ppqn()
+        : event.app.clock.pulse_duration * event.app.api.ppqn();
 
-    const bend = this.values.bend ? this.values.bend : undefined;
+      const bend = event.values.bend ? event.values.bend : undefined;
 
-    const port = this.values.port
-      ? this.midiConnection.getMidiOutputIndex(this.values.port)
-      : this.midiConnection.getCurrentMidiPortIndex();
+      const port = event.values.port
+        ? event.midiConnection.getMidiOutputIndex(event.values.port)
+        : event.midiConnection.getCurrentMidiPortIndex();
 
-    this.midiConnection.sendMidiNote(
-      note,
-      channel,
-      velocity,
-      sustain,
-      port,
-      bend
-    );
+      event.midiConnection.sendMidiNote(
+        note,
+        channel,
+        velocity,
+        sustain,
+        port,
+        bend
+      );
+    }
+
+    if(this.values.chord) {
+      this.values.chord.forEach((note: number) => {
+        play(note, this);
+      });
+    } else {
+      const note = this.values.note ? this.values.note : 60;
+      play(note, this);
+    }
+    
   };
 }
diff --git a/src/classes/SoundEvent.ts b/src/classes/SoundEvent.ts
index 90de244..cd36250 100644
--- a/src/classes/SoundEvent.ts
+++ b/src/classes/SoundEvent.ts
@@ -90,6 +90,7 @@ export class SoundEvent extends AudibleEvent {
     return this;
   };
   public sound = (value: string) => this.updateValue("s", value);
+  public chord = (value: number[]) => this.updateValue("chord", value);
   public snd = this.sound;
   public nudge = (value: number) => this.updateValue("nudge", value);
   public cut = (value: number) => this.updateValue("cut", value);
@@ -162,7 +163,15 @@ export class SoundEvent extends AudibleEvent {
     this.values.freq = midiToFreq(note);
   };
 
-  out = (): object => {
-    return superdough(this.values, 1 / 4, this.values.dur || 0.5);
+  out = (): void => {
+    if(this.values.chord) {
+      this.values.chord.forEach((freq: number) => {
+        const copy = {...this.values};
+        copy.freq = freq;
+        superdough(copy, 1 / 4, this.values.dur || 0.5);
+      });
+    } else {
+      superdough(this.values, 1 / 4, this.values.dur || 0.5);
+    }
   };
 }
diff --git a/src/classes/ZPlayer.ts b/src/classes/ZPlayer.ts
index fc573aa..75313f9 100644
--- a/src/classes/ZPlayer.ts
+++ b/src/classes/ZPlayer.ts
@@ -3,7 +3,7 @@ import { Editor } from "../main";
 import { Event } from "./AbstractEvents";
 import { SkipEvent } from "./SkipEvent";
 import { SoundEvent } from "./SoundEvent";
-import { NoteEvent } from "./MidiEvent";
+import { MidiEvent } from "./MidiEvent";
 import { RestEvent } from "./RestEvent";
 
 export type InputOptions = { [key: string]: string | number };
@@ -144,6 +144,9 @@ export class Player extends Event {
           "parsedScale"
         );
         return new SoundEvent(obj, this.app).sound(name);
+      } else if(event instanceof Chord) {
+        const pitches = event.freqs();
+        return new SoundEvent(event, this.app).chord(pitches).sound(name);
       } else if (event instanceof ZRest) {
         return RestEvent.createRestProxy(event.duration, this.app);
       }
@@ -155,20 +158,23 @@ export class Player extends Event {
   midi(value: number | undefined = undefined) {
     if (this.areWeThereYet()) {
       const event = this.next() as Pitch | Chord | ZRest;
+      const obj = event.getExisting(
+        "note",
+        "pitch",
+        "bend",
+        "key",
+        "scale",
+        "octave",
+        "parsedScale"
+      );
       if (event instanceof Pitch) {
-        const obj = event.getExisting(
-          "note",
-          "pitch",
-          "bend",
-          "key",
-          "scale",
-          "octave",
-          "parsedScale"
-        );
-        const note = new NoteEvent(obj, this.app);
+        const note = new MidiEvent(obj, this.app);
         return value ? note.note(value) : note;
       } else if (event instanceof ZRest) {
         return RestEvent.createRestProxy(event.duration, this.app);
+      } else if (event instanceof Chord) {
+        const pitches = event.notes();
+        return new MidiEvent(obj, this.app).chord(pitches);
       }
     } else {
       return SkipEvent.createSkipProxy();
diff --git a/src/documentation/ziffers.ts b/src/documentation/ziffers.ts
index 83d3974..e01c828 100644
--- a/src/documentation/ziffers.ts
+++ b/src/documentation/ziffers.ts
@@ -101,6 +101,41 @@ z1('w [0 [5 [3 7]]] h [0 4]')
   false
 )}
 
+## Chords
+
+Chords can be build by grouping pitches or using roman numeral notation, or by using named chords.
+
+${makeExample(
+  "Chords from pitches",
+  `
+z1('q 024 468').sound('sine').scale("minor").out()
+`
+)}
+
+${makeExample(
+  "Chords from roman numerals",
+  `
+  z1('i i v vii vi iv iv v').sound("pad").out();
+`
+)}
+
+${makeExample(
+  "Named chords with repeats",
+  `
+  z1('e C9:4 Emin:4 F7:4 Emaj:4')
+  .sound("stab").sustain(2.0).out()
+`
+)}
+
+${makeExample(
+  "Transposing chords",
+  `
+  z1('q Fmaj Amin Dmin Cmaj Cdim')
+    .key(["F3","E3","D3","E3"].div(3))
+    .sound('sawtooth').out()
+`
+)}
+
 ## Algorithmic operations
 
 Ziffers provides shorthands for **many** numeric and algorithimic operations such as evaluating random numbers and creating sequences using list operations:
diff --git a/src/themes/toposTheme.ts b/src/themes/toposTheme.ts
index 3fbf239..40c48de 100644
--- a/src/themes/toposTheme.ts
+++ b/src/themes/toposTheme.ts
@@ -63,7 +63,7 @@ export const toposDarkTheme = EditorView.theme(
     },
     ".cm-activeLine": {
       // backgroundColor: highlightBackground
-      backgroundColor: "rgb(76,86,106, 0.4)",
+      backgroundColor: "rgb(76,76,106, 0.1)",
     },
     ".cm-selectionMatch": {
       backgroundColor: base04,
diff --git a/tsconfig.json b/tsconfig.json
index a28617f..1ad475b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "target": "ES2020",
-    "useDefineForClassFields": true,
     "module": "ESNext",
     "lib": ["ES2020", "DOM", "DOM.Iterable"],
     "skipLibCheck": true,
diff --git a/yarn.lock b/yarn.lock
index a0c2402..ec0ad2f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1451,10 +1451,10 @@ yaml@^2.1.1:
   resolved "https://registry.yarnpkg.com/yaml/-/yaml-2.3.1.tgz#02fe0975d23cd441242aa7204e09fc28ac2ac33b"
   integrity sha512-2eHWfjaoXgTBC2jNM1LRef62VQa0umtvRiDSk6HSzW7RvS5YtkabJrwYLLEKWBc8a5U2PTSCs+dJjUTJdlHsWQ==
 
-zifferjs@^0.0.19:
-  version "0.0.19"
-  resolved "https://registry.yarnpkg.com/zifferjs/-/zifferjs-0.0.19.tgz#a3e1fc04b12cef1f59a78f3d23229b072d9f0a60"
-  integrity sha512-mdrfac/ryDF1MEC1iMCV9KTj36AXNVsiDoYiDEA5ZCYFuHqfzS5s2aCh2iK6teyRKTIagE2IvZCrsTacB5GBBg==
+zifferjs@^0.0.21:
+  version "0.0.21"
+  resolved "https://registry.yarnpkg.com/zifferjs/-/zifferjs-0.0.21.tgz#5df0c6541ae189b2515b4eb4856eb9d2c0610778"
+  integrity sha512-wJat1nbeCJ1j7+5YpeB5MnZdbyFfAwVRB8Ei+cgViEtjidwe4oCLtNq1p8Gq1PjjpSzr32YR57egCdME2Lb5qg==
 
 zzfx@^1.2.0:
   version "1.2.0"