How to write raw MIDI bytes to Linux Midi Through client?

The command line utility amidi may be used to send MIDI hexadecimal bytes to any alsa rawmidi port identified in amidi -l. I have a piece of music software (Organteq) which monitors Midi Through for any messages. I would like to write to this software by writing to Midi Through. Unfortunately, the port does not show up on amidi and thus I cannot write to it. The port does show up on aplaymidi and pmidi, both of which do not support raw bytes, only sending midi files: aplaymidi -l Port Client name Port name 14:0 Midi Through Midi Through Port-0 20:0 CLASSIC ORGAN CMK3 CLASSIC ORGAN CMK3 CLASSIC ORGA. It is also visible on aconnect: aconnect -l client 0: 'System' [type=kernel] 0 'Timer ' Connecting To: 144:0 1 'Announce ' Connecting To: 144:0, 128:0 client 14: 'Midi Through' [type=kernel] 0 'Midi Through Port-0' Connecting To: 128:1 client 20: 'CLASSIC ORGAN CMK3' [type=kernel,card=1] 0 'CLASSIC ORGAN CMK3 CLASSIC ORGA' Connecting To: 128:2 client 128: 'Organteq' [type=user,pid=2372] 0 'announcements ' Connected From: 0:1 1 'Midi Through Port-0' Connected From: 14:0 2 'CLASSIC ORGAN CMK3 CLASSIC ORGA' Connected From: 20:0 client 144: 'PipeWire-System' [type=user,pid=1100] 0 'input ' Connected From: 0:1, 0:0 client 145: 'PipeWire-RT-Event' [type=user,pid=1100] 0 'input ' So, how may I write 1) to client 14, or perhaps even better, 2) write directly to client 128?