Here's a quick sound demo of a string patch I created on my PSR-S700. It's a combination of two sounds, and the violin used sounds NOTHING like the preset. I had to really dig into the voice creator to make this patch. There's nothing in the S-700's preset list like this sound (so I had to create it myself).
There's a bum note towards the end, but hey it is what it is and I didn't feel like rerecording it again
https://soundcloud.com/d-provost/s-700-custom-strings-patch
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.