Share something the user made on a device with every SynthHub user, under CC BY-SA 4.0: a sound, a sequence or pattern, a kit, a project, a bank of their own sounds, or a MIDI clip any device can play. Its content: the device's own data (SysEx, e.g. from backup_presets), settings by driver address (from list_routes, e.g. {'/filter/cutoff': [90]}, which also works for devices without dumps), and/or a standard MIDI file. Only what the user made: never factory presets, nor sounds or sequences bought or downloaded from others — set own_sound only after asking the user. Made from someone else's shared preset? Pass derived_from: it credits them, as the licence requires. Describe it well (category, genres, tags, tempo, key, tips): that is how people find it. The same content shared twice returns the existing id; the author publishes new versions with update_preset and can withdraw it (withdraw_preset). Through a relay, the device data can be captured from the device itself: pass code and start the dump from the device's menu during the call, or give request_hex (the device's dump-request message, which the user accepts at the relay). An audio preview is added by its author with PUT /u/<account>/v1/presets/<id>/audio (MP3, Ogg, M4A or WebM, 1 MB at most).