Instrument and FX Presets
Each instrument has its own preset library that just sets that instrument's tone (brightness, decay, reverb, and so on) without touching the sequencer or the other instruments. Open an instrument in the Instruments view to see its preset picker.
These are different from scene presets — scene presets configure the whole sequencer + all three instruments together; instrument presets only touch the one instrument.
Handpan
Pure Tone, Bright, Mellow, Resonant, Dry, Cathedral, 432 Hz.
Gong
Aggressive, Bright Crash, Classic Gong, Dark Ambient, Deep Crash, Gamelan, Meditation, Muted Gong, Opera Gong, Shimmer, Singing Bowl, Tam-tam, Temple Bell, Thunder Sheet, Wind Gong.
Bowl
Tibetan, Crystal Clear, Deep Meditation, Warm Resonance, Ethereal, Bright Strike, Temple.
Saving your own settings
Custom user presets aren't supported yet — what's listed above is the built-in library. Your last-used scene preset and any manual parameter tweaks persist across app launches, and any setup is captured by the share URL so you can save a particular sound by bookmarking its link.
In a DAW, the host's own preset / patch system stores Orbiter plugin state alongside everything else in the project, so you can save and recall plugin settings via your DAW the same way you would for any other plugin.