Casio VL-10 ADSR modification question

[falconfx]

Hi all, 
I have just acquired a Casio VL-10 pocket keyboard. I was reading online, that because of the main chip's similarity to the VL-1, it might be possible to modify it to have the ADSR synth feature. I was wondering, has anyone tried it? Is it even possible, and if, do you have any ideas of how?
Thanks for answering!