I am working on using a pd patch to send MIDI sysex parameters to control a Kawai K1r synthesizer parameters. My current patch is working however I would like to make my code more "resusable",

My patch consists of a slider with an outlet to a int object that converts the slider value into a whole number, then out to a message object that contains the complete decimal code for the sysex message. I have a $1 at the position where the parameter value should change, so the int object value is inserted into the message string at that point. Then the message is sent out to the midout. I am able to use the slider in my PD patch to change the value of a parameter and see and hear the changes from the synthesizer. My patch currently has 1 slider.

I intend to set up sliders for many parameters, and would like to avoid copying the full sysex message for each slider. It would seem preferable to store the "header" of the sysex message as a constant or global variable and build the sysex string by concatenating 3 or 4 parts; the header, the parameter number, the parameter value and the end of message.

Below is an example message in decimal values:

240 64 0 16 0 3 15 0 $1 247

Reading this left to right, I only need to change the 7th and 9th values in the sysex string. How do I go about doing this in PD?

@hp3 You can do this using [list] and [list prepend]:

If I understand the question right, you are looking for an easy way to copypaste your slider and modify only the controller number?

You can use either list prepend or a message to crete a two bit list consisting of cc# and val before sending it off to the sysex message box which now uses two $ vars. I reckon you could use [pack] as well. I'm not sure which is more efficient, but a message box takes up less space...

Thanks for the replies.

After doing some research I think I should be using an abstraction. I will want to change 4 values in the message. The message structure is below, the pound signs show the parts of the message to change.

240 - status
64 - manufurer id

- channel number

16 - sysex function
0 - Group num (not sure what this is may be internal external storage)
3 - Machine ID number

- parameter number

- source number (1 - 4 audio sources)

- parameter value

247 - end

The parameter value would come from the slider or number object, the channel number, parameter number and source number would come from arguments. Can you provide some advice on how I would merge the fixed values, the slider value and the arguments into a single message? Thanks for any help.

here are screen shots of my two patches.

@hp3 "Can you provide some advice on how I would merge the fixed values, the slider value and the arguments into a single message?"

The methods have already been given to you, but I will do it for you anyway cause I'm such a nice guy. Then Ingox or David will probably show up with more elegant solutions.

sysex.pd

Thanks for the example.

Ahhh my patch wont work, you have to change the final message box- I messed up the order of the parameters.

Let's go over it:

240 - status
64 - manufurer id

• Channel number ($1 in argument, $2 in message)
  16 - sysex function
  0 - Group num (not sure what this is may be internal external storage)
  3 - Machine ID number
• parameter number ($2 in argument, $3 in message box)
• source number (1 - 4 audio sources) ($3 in argument, $4 in message box)
• parameter value ($1 in message box)
  247 - end

So, your message box should read [240 64 $2 16 0 3 $3 $4 $1 247(

sysex.pd <- fixed version

Also consider this: