this is #dope, though. At least I have the machine power currently!
I predict that someone will tell you about a MIDI event processor unit that would convert MIDI note messages from the OT to Program Change messages.
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lol. it appears you have just done so.
i’ll look into my iconnect midi4+ and see if I’ve got that option there.
i’ve really been focused on the OT the most these days, and that’s why I’m dead set on figuring this out one way or another.
edit: midi solutions’ event processor plus’ manual doesn’t say anything about ‘program change’ in it, and their software won’t load on my computer due to my OS being beyond their scope)
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I was about to say he did. 
I don’t think ICM4+ can map Prog Changes, but I didn’t test last software (I had one, now I have an ICM2+ I didn’t try).
EPPlus works like a charm for Prog Change mapping from any midi message, but without their software, seems difficult, unless I send you a SYSEX I made! 
What’s you’re OS?
There are several midi processors you could use for that…
Missed that. Simpler!
But with a midi processor + midi notes, you can have direct access to 128 sounds! I used this with Blofeld > 128 drums sounds controlled by OT’s arp…
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I’m running OS High Sierra… the Midi Solutions box requires Mojave or older…
I’m definitely curious about finding a solution, tho.
This thread, and others, will tell you more than you ever wanted to know about OT and program changes.
The midi solutions event processor (standard or plus) can do it but that is a shame that the software doesn’t run on Macs.
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Should be called “Why I gave up trying to send Prog Changes and Bank Change with OT and bought a midi processor”! 
Macs updates! 
Retrokits RK002. I wrote a script with Retrokits help to trigger OT slices. It also makes DT or OT polyphonic. It handles Prog Changes for sure. It requires Arduino software to program it.
Bomebox seems really interesting too.
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Axoliti is great for MIDI processing but I don’t think they’ll be available for a bit, since development of Axoloti 2 is wrapping up right now.
So many things on my wishlist!
i have this cable!!
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i have a very under-utilized Axoloti!!
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i just had an idea, inspired by this thread:
since I’m only using one external synth, I can have up to 8 channels sending to the microFreak.
…so, per pattern, I can at least have 8 program changes available, and I can mute and un-mute the “changes” as I like, while also experimenting with sending lots of changes to the 'freak.
…it’s close but not quite there yet.
Good idea. Caveats : I’m not sure OT would send each track Program Change more than once.
Unfortunately Bank select is useless without Prog Changes…If you can map CCs or Notes to Prog Changes, that’s good.
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you’re right. just tried and it’s only playing the first program triggered. darnit.
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I just opened the midi matrix expecting to see Prog Change under Bank Sel. and no cigar! Previous post deleted so as not to confuse.
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Curious if I can continue this thread for help:
I’m trying to control my Bass Station 2 from the OT via midi. As I’ve just learned from this thread OT can’t send step/trig-based Program Changes. I do have a Digitakt that I used to use for the BS2, which indeed could do program changes on separate trigs. But I was intending to start using the BS2 on the OT now for OT’s midi Arp.
Now the current problem for OT>BS2, with OT Program Changes set to ON:
After every Pattern/sequence when it loops back to the start of the sequence, the BS2 quickly switches from the desired Patch-preset to preset zero (sometimes to 32?), and then back to the intended patch preset that PROG is set to.
So every time near the end of the sequence one note is played in anóther preset/patch, and then it jumps back to the right patch on the start of the Sequence again. Any advice / insights?
Is this how OT Program Change works? So a message being sent out shortly before the end of the Pattern évery time it loops? (So not with Bank Changes, correct?) And is that what’s causing this quick switch between patches every time around the sequence looping? (Or could the error still be in the BS2?)
Ways to fix this with Program Change set to ON? And if I would set PC to OFF? Any ways to send one-time PC’s at the start of a new song/pattern/bank? Or does that bring us to trig-based PC’s…?
Curious if anyone has got some help!
[addition: I already made a short video showing the problem and my menu settings, could share if helpful]
I bet you also send Prog Changes from MIDI SYNC page. If you want to sync patterns, choose a specific and common midi channel for Prog Change Send for patterns change, and not AUTO.
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Thanks for this, I will try this evening asap!
So I tried once more, but with Program Change send to the midi channel of the BS2 (not to AUTO), the same issue: quick patch-switch around the end of the pattern loop. Very strange. I’ve made a video to better clarify.
When I disable program change in the MIDI SYNC page, this error doesn’t occur, and the sequences throughout the different patterns stay on the correct patch on the BS2. Only I’d hope to save the Program Change with the Patterns, or at least the first one of the track, so in the future I won’t forget which patch-slot I used for it (including the Arp saved on the BS2)…
Any other ideas?
Are there other settings menu’s, that this might be conflicting with? (I’m not sure about the settings in MIDI Control?)
PS (FYI Outside of the video I’m changing the Infinite note that’s triggering the Arp to a shorter time, because I thought that might be causing the issue, but the Program Change / patch-switch problem keeps happening as seen on the screen, only you don’t hear a note playing because of the shorter note length not reaching the end of the pattern)