Sam, from my perspective, and having played both instruments, playing a piano and playing a synth require two, totally different techniques and has absolutely nothing to do with finger strength. An arranger keyboard is played using finger movement, while a piano is played using primarily forearm movement.

All the best,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)