I agree with Fran - This is a case of apples and oranges. The Korg doesn't even have internal speakers, for starters. I was a fan of the I5-S for a while, and I know what you mean about the bass. I think Korg bass patterns are the best, next to the X1 of course! The Solton shines in EVERY way compared to the Ix-300, you would not miss a thing, except maybe the small size and weight.
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Uncle Dave
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"No day but TODAY!" (Jonathan Larson 2/4/60 - 1/25/96)
RHODES 73 suitcase, Korg PA3x, Yamaha psrS-950, Korg i5s, Roland JV1010, Fender basses, Taylor guitars, Parker guitars, Line SIX guitars, Gretsch drums, Zildjian cymbals, Yamaha sax, clarinet, flute