Ani library - trying to create a sequence that pauses between steps & resumes on key press

utopian

Here's what I've got so far. I've kept it as basic as possible. It 'works' in an extremely kludgy fashion– if I keep mashing the 'S' key, it will eventually cycle through all the parts of the AniSequence rotate01, but it will just jump from value to value instead of tweening between them as desired. I'm not really sure how to fix it, so any comments or suggestions are much appreciated.

import de.looksgood.ani.*;
import de.looksgood.ani.easing.*;

AniSequence rotate01;

float rotation;
int currentstep;

void setup(){
  background(50);
  size(500,500);
  frameRate(60);
  smooth(8);

  rotation = 0;
  currentstep=0;

  Ani.init(this);
  rotate01 = new AniSequence(this);

  rotate01.beginSequence();
  rotate01.add(Ani.to(this,0.3,"rotation",PI/2));
  rotate01.add(Ani.to(this,0.3,"rotation",PI));
  rotate01.add(Ani.to(this,0.3,"rotation",PI+PI/2));
  rotate01.add(Ani.to(this,0.3,"rotation",TWO_PI));
  rotate01.endSequence();
}

void draw(){
  background(50);
  if (rotate01.getSeek()>(1/rotate01.getStepCount())*currentstep){
    rotate01.pause();
  }
  fill(205);
  noStroke();
  pushMatrix();
  translate(width/2,height/2);
  rotate(rotation);
  rect(0,0,100,50);
  popMatrix();
}


void keyPressed(){
  if (!rotate01.isPlaying()){
    if (rotate01.isEnded()){
        currentstep = 0;
      }
    if (key=='s'||key=='S'){
      if (currentstep==0){
        currentstep = rotate01.getStepNumber();
        rotate01.start();
      }
      if (currentstep > 0){
        currentstep = rotate01.getStepNumber();
        rotate01.resume();
      }
    }
  }
}