Entering that command will only affect the current shell session. To make it persistent, add it to your shell's configuration so it gets run every time you start a new shell. Since you're probably using bash, you'd need to add that line to ~/.bashrc and then reopen your terminal.
Those warnings are because a plugin 64-bit VST3 plugin with the same name has been found in two of the directories yabridge is searching for plugins. Run `yabridgectl status` and check for MPowerSynth. You'll find two (or maybe even more) entries for the VST3 version of the plugin.
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