alsa/all_notes_off

#!/bin/bash 
#
# Send an "all notes off" event to all channels of all 
# MIDI-Devices configured in the System
# 
# Written by Matthias Nagorni, (c) 2001 SuSE GmbH Nuremberg
#                              (c) 2014 SUSE Linux Products GmbH
#
for d in /dev/snd/midiC?D?; do
    echo Sending "all notes off" to MIDI device $d
    cat /usr/lib/all_notes_off.bin > $d
done
if [ -x /usr/bin/pmidi ]; then
    echo Can execute pmidi. Fine. 
    plist=$(pmidi -l)
    for p in $plist; do
        p1=${p%:0}
        if [ "$p1" != "$p" ] && [ $p1 -gt 16 ]; then
            echo Sending "all notes off" to MIDI port $p
            pmidi -p $p -d 0 /usr/lib/all_notes_off.mid
        fi
    done
fi