Yamaha refuses to call the Performance Recorder a “sequencer” on account of no editing capability, as stated in the FAQ: https://usa.yamaha.com/products/music_production/synthesizers/modx/faq.html
I think most peeps here will think “If it ain’t a step sequencer, it ain’t a sequencer”. My memory is probably faulty but it seemed like Richard Devine used an external sequencer to drive his Montage in the video posted a while back.
Same FAQ says MODX can play MIDI files (SMF and MODX format), so that’s something. Cool that MIDI files can be converted to arpeggio data! I wonder if MODX can be set up to play MIDI clips, or if import into Arpeggio is the only option. I’m sure the answer can be found in the manual too but I wouldn’t mind if you can answer.
Digitone seems like a a great choice of external step sequencer for MODX, especially for those who already own one. I’d probably use my OT and/or iPad, with SunVox being one of the top choices.