Re: [Jsynthlib-devel] Making a Patch for Roland Kit on the HPD-15?

[Daniel R. <dr....@co...>]

Hi Robert,

Thank you so much for your answer. In the days since I wrote my message, I
kept fiddling and ended up sending several sysex messages with a 40ms delay
between each. The biggest problem since then was that the Handsonic said
there was a Midi buffer overflow when in fact I had the checksum wrong for
the subsequent sysex messages. Now it all works.

Never thought I'd be doing this byte-level stuff (and liking it :).

Now I have to decide if what I want to write is really a JSynth driver or
rather a Handsonic controller that does not even use JSynth (i.e., something
like this
http://www.ex5tech.com/ex5ubb_cgi/ultimatebb.cgi?f=6&t=000145&ubb=get_topic).
I thought JSynth would handle the tricky bits, but it turns out that the
javax.sound.midi package handles the hard parts, JSynth structures them in a
particular way, and then I have to write the interaction with the Handsonic.
At the risk of reinventing the wheel I think that doing the structure myself
might be more to the point of what I want to do.

Thank you again for all of your help,
Daniel

On 12/24/07, Robert Wirski <> wrote:
>
> Hello Daniel,
> further action depends perhaps on your sysex device implementation.
> If there is a sysex which changes several parameters, then use it.
> Otherwise, there is no other possibility then sending several sysex
> messages at a time. It requires to write your own sendPatch(Patch)
> method. I did the same in my Roland JD800 driver  (JSynthLib/
> synthdrivers/RolandJD800/RolandJD800SinglePatchDriver.java).,
> Robert.
>
>
> On Dec 22, 2007, at 2:42 AM, Daniel Rosenstark wrote:
>
> > Hello all.
> >
> > First off, thanks to those who responded to me privately, who
> > probably meant
> > to reply to the list. The answer to my last questions were "set the
> > checksumOffset, start, and end values." That worked.
> >
> > So now I've advanced quite a bit in my HelloWorld, and now I have the
> > following code
> >
> >         super.trimSize = 16;
> >         super.checksumOffset = 14;
> >         super.checksumStart = 6;
> >         super.checksumEnd = 13;
> >         byte[] first = new byte[] {
> >                 (byte)0xF0,                         // It's a MIDI
> > System
> > exclusive message!
> >                 0x41,                               // Roland ID
> >                 0x10,                               // Device ID 17
> > (minus
> > one)
> >                 0x00,0x2E,                          // Model ID 2E for
> > HPD-15
> >                 0x12,                               // Command ID
> > (this is
> > data set, could be a request 0x11)
> >                 0x01,0x00,0x10,0x00,                // the offset
> > for the
> > user kit, pad A1
> >                 0x00, 0x00, 0x07,12,                // the nibbled
> > data for
> > the shekere 124
> >                 (byte)0xFF,                         // checksum
> > will go here
> >                 (byte)0xF7                          // end
> >         };
> >
> > which works perfectly for ONE parameter change (I'm amazed. I had
> > never
> > nibbled before :). But now I want to send an entire kit (pads A1,
> > A2, etc.).
> > I've tried the two obvious things, making two sysexs back to back
> > (they get
> > trimmed to one, otherwise the checksum would be calculated just
> > once). I've
> > also tried putting in more than one offset and data (message was
> > received
> > but didn't do the right thing).
> >
> > I can send more than one sysex message, but I imagine there's a
> > better way.
> >
> > Thanks in advance for your help!
> >
> > Best,
> > Daniel
> >
>