It depends on what kind of pads you are interested in. The newest PolySynth has a freeze effect that allows you to freeze/sustain the synth sound and then solo on top of it. Here’s a great example of that: https://www.youtube.com/watch?v=3XM2WSsQ9Qk

You can do the same thing with Polyphony if you’d prefer for the pad to be less of a synth tone. The looper would also work well for this.