This is a very handy tool for recording and amplifying. I bought a Korg SP-170S and it's only drawback was that it had two inputs as mini-jacks ( headphone jacks ) instead of the standardized 1/4" inputs for most electric instruments.
It was also very difficult for me to find any adapter to remedy that. One of which actually nearly cost me the entire keyboard as the adapter wasn't strong enough to take the weight and pressure of other leads and general moving around. The adapter shattered inside my keyboard and caused the keyboard to constantly think it's headphone port is being used which meant it didn't engage the speakers.
After it moving out of that place, I could once again use the speakers (however the piece is still lodged in one of the inputs)
This lead that keeps me from having to use a weak and feeble adapter is a life-saver and gave the keyboard ( which sounds fantastic) a new lease on life to amplify and record with.
I also have a friend who bought the Korg MS-20, which has the same issue, not having a standard 1/4" jack to use as an input. He too ended up breaking it too and needing it to be repaired for similar reasons to myself.
I can't recommend this cable enough. It's fantastic and saved me a lot of money.