As cheaper and cheaper arrangers become quite good sounding, the need gets ever greater that the manufacturers standardize MIDI control codes.
Two or three inexpensive arrangers offer possibilities outside the capabilities of TOTL arrangers, but only if you can link them and operate them as one.
If you feel the desire to try this, you MUST contact your arranger manufacturers, and get them to sit down together and agree on a common set of MIDI codes to control Variation and fill selection, break/fill/mutes, Intros and endings, etc..
Then we will be able to successfully Link two inexpensive arrangers and sound like we have a TOTL one!
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An arranger is just a tool. What matters is what you build with it..!