The RM1X is more powerful as a pure sequencer, but it is missing the nice re-harmonization features of the QY series

And obviously with such an awesome feature like that, it would be important to be able to set the "key" for those other instruments, which this thing does better than any other with its built-in miniature keyboard (look at the photos to see, it has a two octave keyboard of white and block keys) which you can use to "record" the key changes of your sequence