Gotta +1 the request for a 'Beat Sync' option (that doesn't involve sourcing an archaic method of audio pulse signalling like it's 1980)
I've had many, many synths, of those that had arpeggiators the best ones to use, the most inspiring, the most fun, all had BeatSync. Nearly all if not all Roland synths that had Arps had beat sync BY DEFAULT and became the 'world leaders' in ARP usage because of that. Modern Korgs often had the option for 'key latch' or 'free' (iirc) which was basically beat sync or not, again these arps are supremely playable and inspiring.
I love my Prophet Rev2, the best overall synth I've owned in years, and I've own close to 100 synths in the past 20 or so years, but it is a shame to see this issue is still being overlooked by DSI when so many people (who CAN in fact 'play in time' anyway) would really love it, to make an already great synth an even better one.
Just adding that option in the arp parameters would be a massive boost to arp usage/productivity.
And it really is nothing to do with 'playing in time', arps by their nature are sequencers, sequencers are meant to be locked to a beat or they defeat the purpose (I'm simplifying here but if not then we'd all just play these runs by hand
). I play piano and I also play bass and guitar, my timing is rock solid, yet that has little to do with why you'd use 'beat sync' on an ARP.
As someone above mentioned, one great example is Juno 60 with its world famous arp, I've owned juno 60 and I also own polysix, one has beat sync the other doesn't (except via convoluted trigger input which aint nobody got time for in 2017 when hooked up via USB to a DAW already!). I used the Juno 60s arps all the times, I rarely used the Polysix's even though it had an overall better tone and was more fun in general as a synth.
Being able to hit a key before the beat but have it save the actual note change FOR the beat is an excellent system as it allows you to line up the next notes in advance without sitting there focusing only on that one aspect, it allows an arp to open up and feel like a real instrument rather than an idiosyncratic stresser, cos even if you did hit it perfectly in time the effect is rarely the same, it makes the arp feel clumsy ,tripping over itself, not very flowing etc.. at least 9 times out of 10 anyway, and if you have beat sync you play the arp (inc a single note hit to play an arp'd melody line) while your brain/hands go back to doing the next thing (sound tweaks or whatever).
Essentially if there is an internal tally on feature requests I will give 10 of my DSI vote points to this one issue. It's not that It'll kill me without it, it's just I'm unlikely to want to use the arp AT ALL without it and will have to resort to sequencing it (from a DAW or midi ARP plug in that does this), it's just not as fun, inspiring or useful without at least having the beat-sync option.
And for the record, more of the synths have had beat sync than not had it out of the many, many I've used inc analog and digital (VA). And arp is almost a gimmick without beat sync, not a useful tool. You'd be better playing live arpeggios by hand than using a 'stiff' and clumsy non beat sync'd arp imo (of course an arp triggered perfectly in time via a DAW is fine too and you can do that with the rev 2 but it's not good for composing/playing live/coming up with fresh inspirationg from arps)