How can I activate settings for the Equalizer in PulseEffects?

I have installed PulseEffects, but the Equalizer settings are greyed out and inaccessible. It allows me to choose from among my previous equalizer profiles, but I cannot edit them. I can also change settings for other PulseEffects utilities such as the Filter and Limiter. How can I activate settings for the Equalizer in PulseEffects?

I had this same problem so here is the solution.

From an answer on Ubuntu MATE community forum I learned that the lsp-plugins package needs to be installed using the command

sudo apt install lsp-plugins

A reboot is needed afterwards or just log out and log back in.