Fix chord & note issues

src/classes/AbstractEvents.ts

@@ -1,5 +1,6 @@
 import { type Editor } from "../main";
-import { freqToMidi, resolvePitchBend, safeScale } from "zifferjs";
+import { freqToMidi, chord as parseChord, noteNameToMidi, resolvePitchBend, safeScale } from "zifferjs";
+import { SkipEvent } from "./SkipEvent";
 
 export type EventOperation<T> = (instance: T, ...args: any[]) => void;
 
@@ -310,6 +311,49 @@ export abstract class AudibleEvent extends AbstractEvent {
     return this;
   };
 
+  protected updateValue<T>(
+    key: string,
+    value: T | T[] | null
+  ): this {
+    if (value == null) return this;
+    this.values[key] = value;
+    return this;
+  }
+
+  public note = (value: number | string | null, ...kwargs: number[]|string[]) => {
+    if (typeof value === "string") {
+      const parsedNote = noteNameToMidi(value);
+      return this.updateValue("note", [parsedNote, ...kwargs].flat(Infinity));
+    } else if (typeof value == null || value == undefined) {
+      return new SkipEvent();
+    } else {
+      return this.updateValue("note", [value, ...kwargs].flat(Infinity));
+    }
+  };
+
+  public chord = (value: number|string, ...kwargs: number[]) => {
+    if(typeof value === "string") {
+      const chord = parseChord(value);
+      return this.updateValue("note", chord);
+    } else {
+      const chord = [value, ...kwargs].flat(Infinity);
+      return this.updateValue("note", chord);
+    }
+  };
+
+  public invert = (howMany: number = 0) => {
+    if (this.values.note) {
+      let notes = [...this.values.note];
+      notes = howMany < 0 ? [...notes].reverse() : notes;
+      for (let i = 0; i < Math.abs(howMany); i++) {
+        notes[i % notes.length] += howMany <= 0 ? -12 : 12;
+      }
+      return this.updateValue("note", notes);
+    } else {
+      return this;
+    }
+  };
+
   freq = (value: number | number[], ...kwargs: number[]): this => {
     /*
      * This function is used to set the frequency of the Event.