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Build messages for websynth via small interface.

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https://logue.github.io/smfplayer.js/wml2.html
I have this interface below that communicate with  websynth above.
Howto send NoteOn / Off and its velocity is all clear to me just my looking at synth interface code.
But there is also a message protocol SendMessage that i am just to slow to grasp,"or it is to unclear".  

//Synth interface
function Synth() {
        this.sy = null;
        this.Load = function(url) {
            this.sy = window.open(url, "right", "width=900,height=670,scrollbars=yes,resizable=yes");
        }
        this.NoteOn = function(note, velo) {
            this.SendMessage(this.sy, "midi,90," + note.toString(16) + "," + velo.toString(16));
        }
        this.NoteOff = function(note) {
            this.SendMessage(this.sy, "midi,80," + note.toString(16) + ",0");
        }
        this.AllSoundOff = function() {
            this.SendMessage(this.sy, "midi,b0,78,0");
        }
        this.SendMessage = function(sy, s) {
            if(this.sy)
                this.sy.postMessage(s, "*");
        }
    }
var synth = new Synth();

My confusion probably steem from i do not grasp function (sy,s) if this.sy what is sy, s here in send.Message?

Here is what they tell about the interface
===========================================
MIDI messages are sent with the Javascript window.postMessage() function in string format. This function can transport data without cross domain limitation. Then the string format is simply
"midi,nn[,nn...]"
The "midi" is a ID string and following "nn"s are comma-separated MIDI message bytes represented in hexadecimal.For example, Note-On event will be represented like this : "midi,90,c3,64"

The Web-Synth should be implemented at leaset support Note-On "9n,nn,nn", Note-Off "8n,nn,nn" and All-Sound-Off "bn,78,0". Or a instrument with a sequencer like a rhythm-machine may support MIDI sync messages.
The Host should post one MIDI message in one postMessage(). And should not use the MIDI running status abbreviation.
=================================================
This is the message format create comma separated "strings".

https://www.g200kg.com/en/docs/webmidilink/index.html
Tnn	Tempo setting
A,B,C,D,E,F,G	Note name. following number is duration.If the duration is 0, the note is polyphonic.
+,#,-	sharp/flat
R	rest
Vnn	channel volume (nn=0-15) "midi,bx,7,(nn)*8"
@nn	prog change (nn=0-127) "midi,cx,nn"
CHnn	midi channel (nn=1-16)
Lnn	default note duration
.	Dotted note
Onn	Octave
<,>	Octave shift
&	tie
This is the explanation
https://www.g200kg.com/en/docs/webmidilink/spec.html

It could be that the websynth i load to not support full protocol but i think it does, but probably my lack of reading code to create correct message.

Here is how i send note on/off
synth.NoteOff(message.data[1]));.
synth.NoteOn(message.data[1],message.data[2])}

Men hur sänder jag program eller midi kanals byte? Synthen är slav till sequensern så jag behöver aldrig använda protocol 1 som är för att läsa ut värden från synthen.

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Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 06:00 -0700
  Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 06:06 -0700
    Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 08:14 -0700
      Re: Build messages for websynth via small interface. John G Harris <niam@jghnorth.org.uk.invalid> - 2018-09-29 19:01 +0100
        Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 11:33 -0700
        Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 11:47 -0700
          Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 11:52 -0700
            Re: Build messages for websynth via small interface. Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-09-29 22:29 -0700

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