As wrong as it may be, I've heard that for years also. It has been the TOL synths as a justification for price points similar to arrangers. I, personally, don't know. since I have not had a synth since the early eighties.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact