connect turntable to Boss DD 7

The T1 does not have FX send/return. So, unless you are willing to hook the DD7 in between master and PA, you are out of luck.
The Xone:92 has TWO stereo FX send/returns.

My answer was based on the general possibility of sticking outboard FX (external FX) into the chain you mentioned.

Specifically with the DD7. Apart from a whole lot of extra cables or adapters (the DD7 uses 6.3mm jacks throughout) there’s the fact that you’d obviously need two (one for each TT). Then there is the fact that the DD7 is an instrument FX. So I don’t know if they are hi-Z or lo-Z or both. This (the impedance difference) can make it feasible or impossible. But I don’t know the DD7 well enough to say something defnite on the subject.

Bigger problem is that it can only work if the 4000s have line outputs. If they only have phone out, you are (still) out of luck. You cannot hook up a phono output to a line input. Both signal level (significantly less on phone than line) and EQ (phono inputs have a so-called RIAA correction curve) are the reasons this won’t work.

And all of this obviously only if you are really playing vinyl records and not doing DVS. It is possible with DVS if you are using an external soundcard and run the outputs from it through the DD7 before going into the mixer inputs.

Uhm … reading back and taking a close look at the mixer, it has an FX section. So you could just run the necessary FX from the mixer, no?

So, now I am bit lost why you’d want another delay, while you have a perfectly nice one already in your mixer.

It all seems like a lot of work, but yeah, a phono/line converter would work to get the necessary line signal.

And I assume that you can just hook the RMX 500 in the signal path.

So yes, I would think this would work. Again, quite a bit of money and effort (and an increases setup time) to get delay on vinyl. That is your choice of course 😀 .

Also, please don’t post this question under another header again. We don’t appreciate the extra work.