Just wanted to give a heads up to anybody using LMMS with Clear Linux with a midi keyboard. I use a Roland USB midi dongle, but at any rate. You will need to load the seq module manually as for some reason its not loaded on demand or by default.
To load type sudo modprobe snd-seq
You may have to change the default MIDI in LMMS if it’s not already set to ALSA-Sequencer.