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Midi clock filtered too much, slow reaction time to tempo changes #36

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mattpepin opened this issue Dec 27, 2019 · 3 comments
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@mattpepin
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I use a Kemper Profiler guitar amp to generate the midi clock signal. However, when I switch to a different performance (bank/slot) with a different tempo, mod-host takes too long to adjust to the new tempo (it ramps up or down too slowly). I find that the filter does not react fast enough. It makes it impossible to use the midi clock for songs that change suddenly change tempo. If I use:

#define AVERAGE_FILTER_STEPS 7 (instead of 47)

and completely disable the binomial filter, it works perfectly.

@mattpepin
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I forgot to mention that I use mod-host to drive an LV2 metronome for the whole band, so timing is crucial ;)

@falkTX
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falkTX commented Apr 10, 2020

The MIDI Clock sync option has a very long jitter compensation filter because of a kernel issue in the MOD Duo X, which has since been corrected.
But I did not investigate if/how we can change this to a sane values, and what those values are.

How did you come up with "7", is it arbitrary?

@mattpepin
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Yes, it's totally arbitrary but I came up with it after some tests. In my case, it seems to work well.

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