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In this video you will learn how to check a TROMBONE, whether it is a SLIDE or PLUNG TROMBONE, before buying it or if you already have it, so you can know if it works or not... To see the explanation of the SLIDE TROMBONE go to 1:36 To see the explanation of the PLUNG TROMBONE go to 9:46 I hope you like it and it is very useful, thanks and greetings...