From Keen On Keys. The SA-50 is a small keyboard with 32 mid-sized keys, 100 tones, 50 rhythms and 10 songs. It was released in june 2022. It’s based on the SA-46/47 from 2010, but has a few improvements like 32 note polyphony, octave switch, metronome, reverb, transpose function, a couple of stereo tones and…