createSound(time: any, char: string) {
    for (const c of char) {
      switch (c) {
      case '.':
        this.gain.gain.setValueAtTime(1.0, time);
        time += this.dot;
        this.gain.gain.setValueAtTime(0.0, time);
        break;
      case '-':
        this.gain.gain.setValueAtTime(1.0, time);
        time += 3 * this.dot;
        this.gain.gain.setValueAtTime(0.0, time);
        break;
      }
      time += this.dot;
    }

    return time;
  }