im asking-midi the In's & Out's?

MPC 2000XL control a Pioneer EFX-500 Performance Effector Digital Effects Processor or vice versa
ref they both have midi ins & outs

without a PC

Try this site:

www.tweakheadz.com

They show you how it works both ways and vice-versa.

Get to know your gear first then think about which one will suit you as master and the other the slave. And no, I'm not making a racist gesture.

i don’t see how to make them control one another without a PC

http://www.cddj.com/ppdj/products/efx500/efx500.pdf

page 18.

I don't know what you're trying to do, but the few things you could do are covered in those two diagrams in the manual.

The two quotes in the manual cover what's possible -

"SYNCHRONIZING AN EXTERNAL SEQUENCER USING AUDIO SIGNALS"
An external sequencer can be synchronized with rhythms generated by a CD player or other unit. (EFX MIDI Out to MPC's MIDI In, EFX needs an audio source plugged into it's Audio In to do it's thing)

"SYNCHRONIZING BEAT EFFECT TO AN EXTERNAL SEQUENCER"
The EFX-500 beat effect can be synchronized with the rhythms generated by an external sequencer. (MPC MIDI + Audio Outs to EFX MIDI + Audio Inputs)

did not think of looking a the manual, Thank you man, and thats y your the Bos
& with a link YES!