Try setting Blofeld’s MIDI channel to, let’s say 9.
In DT, MIDI Config - Channels, set Track A channel to 9 also.

Channel 1 is by default going to trigger Track 1, but you can change it, or turn it off, in the same sub-menu.

You might want to turn Local Off on the Blofeld.

Or you could try the auto channel… (see manual ;))

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