They are intended to be used with your USB or MIDI Keyboard. It also depends on the software instrument you are using as to how much control you have over these parameters.
However, load up a synth pad, like caffeine trance for example, and open the Musical typing keyboard. While recording you can adjust the pitch bend, modulation and sustain using the relevant buttons on your Mac's keyboard.
Once recorded, you can switch to these advanced modes.
You can also draw Nodes for these advanced modes. Hold down the Cmd key and the cursor turns into a pencil. Click on a line to add a node.
Hope that helps,