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@Avi > The MASTER TEMPO button above the pitch slider does just that.
I am getting my feet wet with the DDJ-RX but I was dismayed to discover that there is no key lock button.
It would seem to me that this is a basic feature that should be standard on any controller. Was this an oversight in the design or am I missing something?
@Avi > The MASTER TEMPO button above the pitch slider does just that.
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Thank you, I just discovered that and I was about to post the update.
Might be a good idea to include that more clearly in the documentation.
@Avi > Master Tempo has been on Pioneer products since the 90's, it's widely known that this is their "key lock."
I haven't been using Pioneer products since the 90s. I just made the jump from Numark this month.
The DDJ-SX2 has a button which is labeled Key Lock/Tempo Reset, not Master Tempo, so when I didn't see that on the RX I was concerned.
@Avi > On page 10 of the DDJ-RX owner's manual, you will find details for the controller's knobs and buttons, with descriptions as to their functions, including the Master Tempo.

Just so you understand, my suggestion of clarifying the documentation was not meant to imply that your documentation is unclear. It was simply to suggest a way that might help newcomers to Pioneer products (like myself) get acclimated better.
I have always called that button the Key Lock. When I was watching a demo of the SX2, I saw that it also referred to it as the Key Lock. When I did not see a Key Lock button on my RX, I opened the PDF of the user manual on my computer and did a search for "key lock." When no results were found, I downloaded the SX2 user manual, did the same search, and found it immediately (BTW, the SX2 documentation has no reference whatsoever to anything called "Master Tempo").
This concerned me, so I posted the question and later made the suggestion that the documentation be clearer for newbies like me.
In no way did I intend to insult and/or start an argument with a helpful Pioneer tech on my first post, and I apologize if I inadvertently did so.
@Avi > And I'm not trying to make it an argument, I simply posted the capture of that part of the documentation for the text description of the Master Tempo feature which says "the key does not change." I went to verify that it does state the word "key" so others wouldn't be confused. If you searched for "key lock" and not just "key," or you didn't fully read the manual, I could see why this was missed.