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Optimizing System Exclusive messages to a synth

Apr 20 2009 | 3:27 am

So I got this old-school synth (free!) and built a control patch for all the parameters, so I can control it much more easily than the built-in buttons which are totally unwieldy. Works great using the [sxformat] object, but I’d like to use [pattr] to morph between settings like cutoff and resonance and whatever else, and when I do, it’s just way too much for the MIDI and/or the synth to handle…so lots of dropouts happen in the sound as it tries to keep up.

What I was wondering was whether it’s possible to collect a bunch of param changes into a list and use the [sxformat] to send a whole slew of them at once. Looks like one can send up to the $i9 value in the sxformat, but I seem to remember that some sysex commands can have a list of values (param # — value pairs) sent all at once, between the begin-end commands. If the sxformat object isn’t set up to handle this, perhaps there’s a way to format it manually with itoa or something? Sending lists, even in a series of pairs, might work better, if there’s less of the "begin—command—end" data to send.

Any thoughts would be great. It’s certainly not a huge issue, but experimenting with the limits of what it can do would be cool.

The synth is a Korg DW-8000, screen shot attached.



Apr 20 2009 | 3:47 am

the only way to send more sysex data than one by one would be to build the whole patch in max, and send that as preset dump to the device.

Apr 21 2009 | 10:47 am

Use speedlim to limit the amount of messages for your pattr interpolation. It will jump a bit maybe, but not bug out…

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Forums > MaxMSP