José. Thanks for providing more details re: the Sennheiser IE-3 ear buds. Wow, I didn't realize that there are no other parts required, and that the $139.95 (US dollars from Musician's Buy) IE-3 ear buds alone is ALL I need to purchase.

Even though taking around Tyros satellite speakers & sub woofer along to gigs isn't really not that much of a hassle, your ear bud option certainly would make it a lot easier and convenient. My only reservation at this time is the sealed off isolation it poses, especially because (for me), relating/communicationg with the audience is as important as my performance.

Scott