[LAU] crackling sound

[Fero Kiraly]

Hi friends,

I have a weird crackling sound (it happens sometines, but often)
it is no xruns.

I am using archlinux->jack->rtirq->presonus 1818VSL=>MIDI keyboard

it happens when i hold long tones with Zynaddsubfx or bristol.

Do you have an idea what it could be ?

thanks.

fero.
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