This is just a dumb little demo to remind you what tones to play, in case you are lost in the desert and see bright lights. It uses Midi::Realtime to play tones. It's not terribly well written, but it will impress an 8-year old. :-)
#!/usr/bin/perl
use warnings;
use strict;
use MIDI::Realtime;
use Tk;

my $midi = MIDI::Realtime->new(
        dev         => '/dev/sequencer',
        midi_device => 1
);    #1,2,3,4 

#5 for external keyboard 
#thru USB UM-1 connector 
my %rects;
my $mw     = tkinit;
my $canvas = $mw->Canvas(
        -bg     => 'black',
        -width  => 250,
        -height => 240,
)->pack();

my $z = 0;
my $w = 0;
for my $x ( 1 .. 5 ) {
        for my $y ( reverse( 49 .. 60 ) ) {
                $rects{ $x }{ $y } =
                        $canvas->createRectangle( $z, $w, $z + 50, $w 
++ 20,
                        -fill => 'lightblue' );
                $w += 20;
        }
        $z += 50;
        $w = 0;
}
$mw->waitVisibility;
$mw->after( 1000, sub { &signal_et } );

MainLoop;
######################################################################
+###### 
sub signal_et {

        $midi->patch( 57 );    #change instrument, 

        my $time = 1;
        for ( 1, 2 ) {
                $w = 1;
                foreach my $num ( 58, 60, 51, 49 ) {
                        $midi->note( $num, 1, 90 ); #note,channel,volu
+me 
                        $canvas->itemconfigure( $rects{ $w }{ $num }, 
+-fill => 'hotpink' );
                        $mw->update;
                        select( undef, undef, undef, $time / $_ );
                        $midi->note( $num, 1, 0 );
                        $canvas->itemconfigure( $rects{ $w }{ $num },
                                -fill => 'lightblue' );
                        $mw->update;
                        $w++;
                }

                $midi->note( 56, 1, 90 );
                $canvas->itemconfigure( $rects{ 5 }{ 56 }, -fill => 'h
+otpink' );
                $mw->update;

                select( undef, undef, undef, 1 );
                $midi->note( 56, 1, 0 );
                $canvas->itemconfigure( $rects{ 5 }{ 56 }, -fill => 'l
+ightblue' );
                $mw->update;

                select( undef, undef, undef, 1 );
                $midi->patch( 56 );    #change instrument after 1rst v
+olley 
        }


#response 
        $midi->patch( 55 );        #et's instrument 
        foreach my $num ( 58, 60, 51, 49 ) {
                $midi->note( $num, 1, 127 );
                select( undef, undef, undef, .5 );
                $midi->note( $num, 1, 0 );
        }
        $midi->note( 56, 1, 127 );
        select( undef, undef, undef, 1 );
        $midi->note( 56, 1, 0 );
        select( undef, undef, undef, 3 );

exit;

}

__END__

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In reply to Signal-ET by zentara

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