Insert a midi track (midi in: No input / midi out : Elektron A4 chan 16)
Create a midi clip in that track with Launch parameter set to “Gate” and quantize to “None”.
In Notes clip parameter, use the PGM selector to call for one of the 128 patterns (PGM1 =: A1 / PGM128 = H16).
That’s it, playing that clip will call the pattern instantly.