When composers like Telemann used this kind of notes, they prepared the use very well for the player either by using a special emphasis (leit ton) or gradually stepping down by lipping it, but for very few notes. Brahms was a master in this aspect, even the trio sounds much better on the valved horn than the often heard howling wolves on the hand horn, which is abused as a "stopf-horn" so often instead being played as a "hand muted" horn.
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