I suggest looking here. Someone there should have what you're looking for.
http://forums.rolandclan.info/ Squeak
If you don't mind could you email me a review of the Xa, and tell me what you think of it? I'd be very interested to know your opinions about this synth.
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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.