Well, that's what YOU think.
I've been using mine for more than 10
months and finally figured out
something was wrong with this synth.

I've checked other JX-305 at different
shops and all of them were bugging under the same circumstances.

If you still think your JX works fine, I can send you a Sysex file containing a particular
pattern I made with it and you'll be able to judge by yourself.

'Nuf said.