Kala KA-SMS Spalted Maple Soprano Ukulele. One of Kala's most attractive 'step-up' offerings in their exotic wood ukulele series, the Kala KA-SMS Spalted Maple Soprano is handsome looking player as well as a typically sweet sounding one. The Kala signature sound is here, bright, pleasantly ringing with delicate overtones, and volume that defies an instrument of this size. Spalted maple top, back and sides gives the sound of this ukulele a slighter harder edge than other tonewoods, with a nice percussive attack and a rich and rounded sustain. For those who like their ukulele sound with a little extra spark and top end punch, the Spalted Maple series should fit the bill.