Ill start with question 2:
2. What claims did he make which have been proven not to be true?
Yes you have definitely addressed every concern by giving a method to achieve what he claims is "missing". I am merely giving my feedback stating that the "method" of achieving most of the staple standard arranger functions are tedious and counter productive.
My real point to most of what I said above was not to say - it cant be done on the EVENT, I just think that the overall control and interface design puts a shadow over such a beautiful machine.
Its just a shame - there is so much real estate on the keyboard yet the buttons and controllers you have decided to include are all squashed together where they could be laid out more intuitively over the keyboard for ease of operation (and understanding). and of course -there could definitely have been more buttons. (think of the Roland EA-7) at a glance it looks like a nightmare - but it is in fact one of the easiest arrangers to pick up and use.
Now to answer #1 -
you asked me to provide examples of your "claims"... Ide rather not go down a tit for tat scenario but since you asked

35:25 "I just downnn graded the EVENT to a Midi Arranger just like any other midi arranger out there"
hmmmmm given that ALL your competitor products are Midi Arrangers is basically giving off the impression or "claiming" superiority. Although Midi styles may sound inferior to audio, it has a lot of benefits over the audio styles (for example - editability) so its not reallllly a downgrade...
36:00 "Ketron as an example leaping years ahead of other arranger manufacturers". ehhh maybe in the audio style department but same could be said from other brands about some of the features and sounds in their keyboards too... its a very subjective area...
37:02 "There's a reason why people are always trying to compete or compare or try to sound like an EVENT"... who is??
Keyboard players are always on the hunt for the best sound no matter what - whether its through sampling, editing / sound creation or chasing the latest and hottest gear.
It all depends on what style or genre of music you are playing as well - not to mention how easy and intuitive the machine is to operate... I could probably guarantee you that If I had an EVENT or any other Ketron Product I would be trying to add and improve the sounds and styles of its EDM / Synth Department... does that mean I'm trying to make the EVENT sound like a Korg or Yamaha? (I remember When I owned the Audya5 it was total lack luster in that category for synth, EDM, Trance etc).
By the way - in no way am I stating that other brands are perfect - not by any means! In fact I have a huge list of issues and bug bears with Yamaha Korg and also Roland keyboards. I only wish that other manufacturer designers and product specialists posted here so I/we could give constructive feedback to them - publicly!
Unfortunately you seem to be one of the only reps that is regularly active on SZ to be available to take the heat
