Is my volca keys messed up or is there a reason for this?

[SynthWizard]

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Is my volca keys messed up or is there a reason for this?

<!-- SC_OFF --><div class="md"><p>New to synths and all this stuff. I have a korg volca keys and I just got a boss dr-220A drum machine like yesterday</p> <p>When I use the sync out from the dr-220A into the volca nothing happens but when I go from the headphone jack to the sync-in on the keys they do sync up</p> <p>I noticed the same thing with a cheap little Casio keyboard I have. It doesn’t even have a sync-out or a midi connection but when I use the headphone jack I can control the volca with it </p> <p>Maybe this is normal I’m just curious why it syncs up when the audio is coming from a headphone jack but not a sync-out? Also why it syncs up with audio from a headphone jack at all? </p> <p>Casio sa-76 and the dr-220A is all I own so far so haven’t tested the volca with anything else</p> </div><!-- SC_ON --> submitted by <a href="https://www.reddit.com/user/imoan-"> /u/imoan- </a> <br/> <span><a href="https://www.reddit.com/r/synthesizers/comments/ilgyk1/is_my_volca_keys_messed_up_or_is_there_a_reason/">[link]</a></span> <span><a href="https://www.reddit.com/r/synthesizers/comments/ilgyk1/is_my_volca_keys_messed_up_or_is_there_a_reason/">[comments]</a></span>