But snapshot are working now. The extender has to be off.

In my case (v.1.93 atm)  the snapshots work (sure - only if Mackie protocol is on).

Du you use different IAC busses for IN and OUT.

In my case
IAC Bus1 mapped as IN in TM
IAC Bus2 mapped as OUT in TM

I use Pocket MIDI with the (Views -> Keyboard) just now to test.
In PM settings: MIDI OUT goes to IAC Bus1 and and Midi IN to IAC Bus2.

----

I think its the TM midi loopback detection. As Mackie Protocol sends a lot of sysex stuff - and TM the same (every touch in generates them)... and if it would send and receive its own messages, it would lead to a unlimited loop...

afaik the official MIDI Standard implemented Active Sensing Messages and things like "ALL Notes Off" for these situations...
But I am not a RME expert. For me it seems TM behaves really strange in certain MIDI situations. But till now i could not really exactly get all detiails to say its a bug. Although it seems that you are right.

I understood this exactly as you as this is in the "MIDI Control" chapter. I ran into the same confusion longer time ago...
So, its either documented not clearly, or wrong, or TM has really a bug.
This behaviour is the same at least from TM 1.78. and up...

"Mackie Control compatible controller is not required" is generally true ("real" Mackie Hardware Controller not needed). But maybe RME meant this like this? Thats just how i interpreted this for me:

You had not checked Mackie Protocol Enabled in this scenario?
If Yes, same here - No Mackie Protocol Enabled in TM - no Note Messeges either accepted or tranceived.

You had checked Mackie Protocol Enabled in this scenario, right?
Its the Midi Loopback Detection. From Manual:

Same here too (look, the messages are sent in 0.5 ms intervals):

20:46:43.401    From IAC Bus1     Note On    16    G9    90
20:46:43.416    To IAC Bus1       Note On    16    G9    90
20:46:44.220    From IAC Bus1     Note On    16    G9    90
20:46:44.232    To IAC Bus1       Note On    16    G9    90
20:46:45.042    From IAC Bus1     Note On    16    G9    90
20:46:45.056    To IAC Bus1       Note On    16    G9    90
20:46:45.864    From IAC Bus1     Note On    16    G9    90
20:46:45.864    To IAC Bus1       Note On    16    G9    90
20:46:46.681    From IAC Bus1     Note On    16    G9    90

Afaik, IAC Busses are behaving like an MIDI THRU enabled device.
But... what i dont understand: TM should disable the MIDI Functionality in this case. But it doesnt...?

And I remember, I had situations, where TM disabled it - i used the units hardware port with a real synth and activated midi thru accidentally.

Fortunately a Mackie Control compatible controller is not
required to control these buttons, as they are steered by simple Note On/Off commands on
MIDI channel 1.

With buttons I understand also snapshot buttons and the list provides Note-On commands for the snapshot buttons.

But I don't get it to work now with the actual TM 1.93
Totalmix does not receive Midi notes or it ignores them.
No reaction at all.
And furthermore if you select a Midi output, Totalmix is sending a Midi Note-On command repeatedly like crazy !
Setting the Midi output to none stops this.
This is the monitored Midi produced by Totalmix :

Total Reset didn't help.

Until now I have not gotten any reaction at all from Totalmix on any of the published note on messages.

If you want any feedback via MIDI from TM, you have to enable Mackie Protocol.
Thus, you need to assign a Midi Output Port.

See p.58 in your Manual:

Mackie Control Options
 Enable Protocol Support. When disabled TM FX will only react on the Control Change commands of chapter 24.5.

wadi, maybe you was wrong? Or i misunderstood sth?

In Totalmix in the menu Options, enable midi control
Midi input, whatever is your computersystem Midi
Midi output : none

Can I control the babyface by midi over the USB cable from my DAW?

I want to simply switch between snapshot 1 and snapshot two when I change patches in my DAW.

If it matters, I am using Gig performer in conjunction with a bass guitar into external effects, than into Babyface/Gig performer finally out to poweramp/bass cab.

My idea is to avoid latency roundtrip by using a snapshot set to only monitor the input (bass guitar after external efx) and then only use the software playback and mute the input when using VST effects inside Gig performer.

Until now I have not gotten any reaction at all from Totalmix on any of the published note on messages.

Thanks for any hints,

Frode