For changing setups/multis from external, you need to first enable Local Keyboard Channel to one channel. From your external machine, send MIDI Program and Bank changes through that channel, then your setups/multis will change.

Thanks Hipogrito. I did figure out that much. What I can't figure out is what actual commands to send. Espe the MSB/LSB numbers. I read the manual but I can't figure out how to translate from say, my Setup #1301 (Copperhead Road for me), to the numbers that the iPad can send, which are:
Ch.
MSB
LSB
0-127

So Ch. I arbitrarily chosen Ch 12 since I don't use it for anything else. But the other 3 fields i'm lost...
Brad

So, you want to select program 1301.

WRONG: Divide by 127 and drop the fraction to get 10.
Divide by 128 and drop the fraction to get 10.
This becomes your bank select number.

Since it's less than 128, the Most Significant Byte (MSB) of the bank number is 0, and the Least Significant Byte (LSB) is 10. (And, yes, they aren't really 8-bit bytes...)

Now, start over, but figure out the remainder:
WRONG: Take 1301, and subtract 10 * 127 from it, to get 31.
Take 1301, and subtract 10 * 128 from it, to get 21.
This becomes your program number in the selected bank.

WRONG: So, channel 12, MSB 0, LSB 31, prog 31.
So, channel 12, MSB 0, LSB 10, prog 21.
I think that should do it.

Yep, it's gross.

But, once you set the MSB/LSB, you don't really have to keep sending them every time, if the new program is in the same bank. MIDI lets you do that, but maybe that application forces MSB/LSB/prog each time.

(I really liked the 0-99 banks on the K2000 series! So much easier, even though it did veer from MIDI's 0-127.)

Good luck!

Edit: 2020-01-12 with much thanks to ioannes for seeing my mistakes!

I think we need to divide by 128 (0..127 are 128 IDs)

so 1301/128 = 10 (without fraction)
and (1301 - 10*128) = 21

bank = 10
prog = 21

Oh my gosh - of course, you are correct!
I'm so sorry!

For reference:

http://kurzweil.com/knowledgebase/pc3k8/setup_mode/473/

Thank you so much everyone. I will try this tonight.
you guys are awesome!

Thanks again everyone. I tried this tonight and it was so easy i guess i should have been able to figure it out.
It worked exactly as you said.
THANK YOU!