Describe the bug
Attempting to use MIDI control for the first time. Launching the Mac client with this command:
open -a "Jamulus.app" --args --mutestream --ctrlmidich "1;f70*8"
The effect of my MIDI controller knobs on the corresponding Jamulus fader UI controls is immediate, but the effect on the actual audio level lags behind by ~10 seconds. If I do the same action by manipulating the UI faders with my mouse, there's still a bit of lag but much less.

To Reproduce
For example, picking a play whose LEDs show the person playing constantly. With UI fader at zero, I quickly move the MIDI controller knob until the UI fader goes all the way to 100%. After about ~4 seconds, the player's sound level starts slowly rising, reaching full after ~10 seconds. If I do the same action by manipulating the UI with my mouse, the audio level reaches full in ~4 seconds or less.

Expected behavior
Manipulating the faders via MIDI should be at least as responsive as manipulating the UI via mouse.

Screenshots
N/A

Operating system
MacOS Big Sur (11.5.2) on MacBook Pro (Retina, 15-inch Mid 2014), 2.2 GHz Quad-Core Intel Core i7, 16 GB 1600 MHz DDR3 RAM

Version of Jamulus
3.8.2 and 3.8.1

Additional context
My MIDI controller is a Akai MPK mini mk3