These little adapters have a ton of uses!
Use them with Korg Volcas or Pocket Operators to split clock/sync connections.
work great with modular synth setups as a passive mult.
I suppose you could also use them to just split an audio signal as well....
*warning - this adapter uses stereo jacks, only use one type of cable for all connection, ie: all mono cables OR all Stereo cables, Don't mix cable types!