[Ardour-Dev] ardour4 vs midi control surfaces (slew rate limiting?)

Paul Davis paul at linuxaudiosystems.com
Sun May 17 18:41:59 PDT 2015

There is a control which I believe is called "Threshold" which can be used
to control this. It is accessed by going to the "Surfaces" tab of
Preferences, and double-clicking on the generic MIDI entry there. Different
hardware needs different values for this - there is no acceptable default.

On Sun, May 17, 2015 at 9:38 PM, Fernando Lopez-Lezcano <
nando at ccrma.stanford.edu> wrote:

> Hi,
> I've seen this behavior before in Ardour3 but it still happens in 4.
> Let's say I enable generic MIDI control, hook up a BCF2000 through the
> a2jmidid -e command and bind a fader to the master fader of a session.
> If I move the physical fader in the BCF2000 slowly all is good. If it goes
> beyond a certain "slew rate" the fader in Ardour gets stuck and stops
> reacting to (fast) movements of the physical fader. It only starts moving
> again if I slow down my movements and cross the last value stored by
> Ardour. It then follows the physical fader again until I move it too fast
> and it gets stuck again.
> Is there a midi command rate limit somewhere in the code? A preference I
> might use to turn off this behavior? Maybe a "feature" of a2jmidid?
> This makes it unusable for a "live" mixer situation (and I have to revert
> to Ardour2 which does not have this problem).
> Weird...
> -- Fernando
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