Crumar roadracer

Thanks Hi , just got vintage Crumar Roadracer very simple instrument so is 3 types of piano sound and base only but has some interesting features like fully polyphonic on all 61 keys and a cool chorus effect which is actually an Electro Harmonix, small stone phaser so I’m thinking to modify this instrument to a string machine if is possible at least change the attack and decay, let me know if anyone has some ideas