Hi, I'll try to explain.  By Miguel from kX forum
  Those red boxes are untranslated VOL modules renamed for making annotations. They consume no DSP resources and are saved with presets, handy to remember what a DSP preset was for. I started with all default settings for the card (routing, DSP). In the DSP I deleted everything but fxbus, fxmix2, chorus, reverb and epilog. On the ASIO sequencer, all tracks should normally output to asio 0/1, with necessary eq and/or inline FX. Now different sequencers have different means of creating busses but all have similar funcionality, so investigate your personal choice.

  So we create six mono busses that output from asio 4 to 9. Now for each track we can send part of the signal to one or more of these buses, then kx will process and merge them on "FXMix2 (FX return)" and mix them with our sequencer main mix on "Stereo Mix (monitor)". You can rename your busses on the ASIO program to resemble the names of the fx they send to.

  You realize I skipped asio 2/3, well that's because it's sent by default to fxbus 2/3 that is used by kx midi synth too. This way fxbus 2/3 will only carry kx synth audio for selective monitoring/recording. You can change all these routings on kXrouter window.

  More on kX synth: I kept the default "Fxmix2" and chorus and reverb to keep compatybility with the standard two FX used on midi sequencers. Now on your midi app you can adjust chorus and reverb for the midi instrument. To do that kX uses fxbus 13/14 to send some of the synth audio. Notice I placed a "stereo mix" in front of chorus and reverb. That's to make these two effects avalable to ASIO sends as well. So synth sends and ASIO sends are merged then processed.

  You may have noticed that fxbus 4/5 are labeled "2 sends to other kx card(4/5)". They go straight to a spdif out connected to the other kx card (It could be an external guitar FX box or whatever). On the other card you can have a pair of more DDP expensive FX like Max M's uFX reverb and the like, wired similarly to this card. At the bottom you can see a Le mury's "Src(other kx card return)", that is merged with the other FX. Ah, remember that each travel from card to card audio loses about 1dB, so place appropiate stereo gains right after the SRC or PROLOG.

  err.. all stereo mixes and "FXMix2 (FX return)" are used as places to merge signals, so keep the faders to 100%. "FXMix2 (FX return)" has two stereo outs, so Ii wired one for monitoring and the other goes to an ASIO in for when you decide to bounce the whole "MIDI synth + FX return" mess. Or you can record only part of the mess, like "MIDI synth + MIDI synth FX", simply open "FXMix2 (FX return)" and set to 0% as you wish. One last note, I used all FX as mono send FX, stereo returns. But you can do also in-line FX by setting a track to out to a pair of ASIO channels other than 0/1. This will process the whole track, but you will run out of ASIO cahnnels quickly. I hope you all reached here, and that it was worthy.

EDIT: I just thought one might want to substitute "FXMix2 (FX return)" with a more intuitive MX6. still it consumes a bit more dsp and i only use this as a merger, and not as a mixer (remember that we mix DSP FX on the ASIO sequencer adjusting the send amounts for each track or midi instrument).

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