I have a Jupiter bass without trill keys. Got it when they first came out since they were the only decent sub $2000 bass flute option. I have played it a few times in church as a solo instrument. Also a couple dinner music gigs with my wife on flute and one of our kids on cello. I recently got the opportunity to to play it in a flute choir. I was concerned that the balance would be poor against 11 flutes but since it was the only instrument playing low notes, it was easy to hear according to musicians I knew in the audience. No amplification.