How to create pulsating synth sound?

[dogmuseum]

You know, that thing where an instrument sort of goes in and out rhythmically...

[musikbear]

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You know, that thing where an instrument sort of goes in and out rhythmically...

That is done in the Low Frequency Oscillator LFO, you find it either on the ENV/LFO-tab of almost all instruments,
https://lmms.io/wiki/index.php?title=In ... .2FLFO_tab
or you set one up in Rack
https://lmms.io/wiki/index.php?title=Controller_Rack
Most VST has LFOs on their GUI

[Myrmidon]

This can also be done with sidechaining. I put some links below to tutorials explaining how to do this:

Sidechaining with Peak Controller: https://www.youtube.com/watch?v=Q02AOg95Wzs
Advanced Sidechaining in LMMS: https://www.youtube.com/watch?v=Il0OH4I0-LE

I recommend using the advanced sidechaining technique. It may seem overly complicated for a simple usage, but it adds an entirely new level of customization that isn't possible with the simpler technique.