See our Mp3 TRACKS, SHEET MUSIC, SCORES for Trombone. Go Here for the slide position chart for a tenor clef trombone with an F attachment trigger.Go Here for the slide position chart for a treble clef standard straight trombone.Go Here for the slide position chart for a treble clef trombone with an F attachment trigger.You adjust the slide position out a little farther if the note is sharp and in a little more if the note is flat. Go Here for the slide position chart for a bass trombone Bb-F-Gb. This chart (chart 1) along with a second chart (chart 2) by Dr. The trombone is great because the adjustments can be made easily by moving the slide position.Go Here for the slide position chart for a trombone with an F attachment trigger.Slide Position Chart for Straight Trombone.The chart itself is two pages so click on the above button to see the entire chart. For more about the function of an F attachment trigger see: These comparisons are for a standard straight trombone – without an F attachment trigger. He has given me permission to adopt this chart. I received an email from Robert Hibberd with a chart he created from my Slide Position Charts to compare the Treble and Bass positions for the benefit of players who have learned from one notation and now desire to learn the other. Opening both valves simultaneously puts the instrument in Ab0. TREBLE & BASS CLEF STANDARD STRAIGHT TROMBONE SLIDE POSITION CHART The modern contrabass trombone is a slide trombone tuned to the fundamental of F1 with two valves, which are activated by the thumb of the left hand and make it possible to lower the instrument's pitch from F1 to Eb1 or Bb0 while playing.