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If you toot one horn in to another it's also a surprisingly strong disruption.

I tried using it as an effect ones, but didn't really succeed to do anything useful (feeding sines through my trumpet while playing it with some Y adapter)

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Technically, trumpets are not horns. Horns have conical bores. Brass instruments have a cylindrical bores and a flare at the end. The flare of a brass instrument is mostly for projection. The conical bore of a horn is primarily for timbre.

You're right that trumpets have cylindrical bores, but that's not a universal characteristic of brass instruments. For example, cornets and euphoniums have conical bores, yet they are brass instruments; their cylindrical-bore counterparts are trumpets and baritones, respectively.

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