Re: Very Rare Instruments
Reply #18 –
"coulisse" ? I assume this means "slide"?
Many trombones have an "F" attachment that is operated by a valve, but they are still "slide" trombones. The single valve adds the same amount of tubing as moving the slide to the 6th position (equivalent to 1st and 3rd valves). A normal tenor trombone is a Bb instrument, the attachment makes it a Bb & F trombone. Most modern bass trombones are in Bb and have 2 attachments. The second attachment is often user selectable but is commonly in D or Eb and can be both dependent OR independant on the 1st attachment being operated - usually buyers choice.
The valve trombone on the other hand does not have a slide. As Bill said, it is more a large trumpet.
In Jazz and orchestral work the trombone is considered a non transposing instrument and scored in concert bass clef. For British heritage brass bands (like the one I first learned 'bone in here in Australia) it is considered a transposing instrument and commonly scored in transposed treble clef. Note that this isn't always the case though. I have seen brass band music for 'bone in concert tenor clef and some bass trombone music in concert bass clef. The latter was usually intended for the old "G" bass 'bone.