The Polyend tracker makes for a complete portable music-making tool as well. https://polyend.com/tracker/ https://polyend.com/tracker/ I'm sure there's others

The Polyend tracker makes for a complete portable music-making tool as well. https://polyend.com/tracker/ https://polyend.com/tracker/ I'm sure there's others, but it's true that the OP-1 offers an impressive feature set for portable production.