I'm using PureData PureData for some MIDI processing (a very versatile tool: i might write a separate article about that at some point), and found out something unexpected:
Running live MIDI though PureData, I noticed the latency left a bit to be desired. Digging around a bit, and triggered by the friendly folks at #dataflow, I tried setting the 'delay (msec)' setting in the Audio settings to a lower value, and it turns out this has a positive effect on the MIDI chunking, too!
As I'm not doing any audio signal manipulation, it seems setting the delay to '1' introduces no problems, and much improves latency.
PureData MIDI latency
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raboof
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Re: PureData MIDI latency
specifying '-sleepgrain 1' (or some other low value) further improves latencies