Seems like the sort of thing you'd use for a drum kit patch (each key is a different kind of drum), but I suppose that wasn't a standard thing when the DX7 came

Seems like the sort of thing you'd use for a drum kit patch (each key is a different kind of drum), but I suppose that wasn't a standard thing when the DX7 came out and wouldn't be for awhile. This demonstrates the factory patches; the train patch (#31) seems to have several different distinct timbres: https://www.youtube.com/watch?v=F3rrjQtQe5A https://www.youtube.com/watch?v=F3rrjQtQe5A