On linux with alsa midi, sysex output works this way:
bang | [t b b b b] | | | | [247( [123( [88( [240( |_____|_____|____| | | [midiout]
That is, banging all the values separately into [midiout] during one message time slot. (Note the message is written backwards since the first byte to transmit is the sysex status byte, 240) Banging them in one at a time manually only sends one byte, banging them in as a list stops [midiout] from working until you reopen the patch.
Martin