Hi Woody,
I am a big fan of the Cab1L controller and use it with a Cab1L base at home and with a Legacy base at my club's layout. I have turned on the quilling on all of my Legacy engines with that feature. I found it quite easy to roll my thumb around the whistle button to quill different tones. I admit that with steam locomotives there is slightly more control of tone with the Legacy controller, but with most diesels the Cab1Lcontroller is more than sufficient.
Earl