Unable to play any video while Qsynth is active

[RayBoucherit]

Hi, I'm using Qsynth in addition with QJackCtl to play with my MIDI keyboard. But when QSynth is active any video or music that comes from another source (Firefox, VLC) is either muted or slowed down.

[rncbc]

don't blame qsynth :)

it's JACK that takes hold of the main sound device: this is fundamental and actually expected.

maybe what you need is pulseaudio-jack-module: install it and then...

retry and setup a proper jackd2 (+jackdbus) system, if you didn't already and Enable JACK D-BUS interface (cf. QjackCtl > Setup > Misc)

or... wait for the pipewire bliss, coming soon... :)

[pedrolcl]

It is even easier: qsynth/fluidsynth may use pulseaudio instead of jack. Connect your MIDI keyboard first, and then...

With a buffer size of 1323 the latency is about 30 milliseconds. Feel free to experiment with other values. The other important setting is "Auto Connect MIDI Inputs" in the MIDI tab:

With the last setting, you don't need to use qjackctl to connect your MIDI controller to qsynth.