Grubb99: Though pianos, synthesizers, arrangers, and even accordions, all share having black & white keys, they're actually all actually very different instruments, requiring uniquely different playing skills, including chord playing styles. If you want to keep up your piano chops, you're just gonna need to devote as much practice time to solo acoustic piano playing as to the arranger. Acoustic piano playing technique involves not just the fingers & hands, but your arms, and on occasion, possibly even your entire upper body, while non-weighted synth playing technique remains more focussed in the fingers & hands. Once you learn to approach playing each keyboard instrument differently, you'll begin to feel comfortable playing & switching back & forth between them. I guarantee that in time, and with persistance & practice, you'll be able to easily adjust back and forth between playing the acoustic piano and your non -weighted arranger keyboard. - Scott