Why do some synths say FM but do PM instead?

[SynthWizard]

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Why do some synths say FM but do PM instead?

<!-- SC_OFF --><div class="md"><p>FM is so much more juicy</p> </div><!-- SC_ON --> submitted by <a href="https://www.reddit.com/user/veiros_the_Shaman"> /u/veiros_the_Shaman </a> <br/> <span><a href="https://www.reddit.com/r/synthesizers/comments/v1p66w/why_do_some_synths_say_fm_but_do_pm_instead/">[link]</a></span> <span><a href="https://www.reddit.com/r/synthesizers/comments/v1p66w/why_do_some_synths_say_fm_but_do_pm_instead/">[comments]</a></span>