Vintage Synth Repair

I received the P8021 chip that I ordered from www.musictechnologiesgroup.com  for the Sequential Pro One synthesizer and that seems to work. 
The only small problem that I have is that the arpegiator stays ON most of the time. Sometime, when I turn OFF and ON the power, the arpegiator turns OFF and the synth behave normally.
I cleaned and checked the arpegiator switch but that's seems to be fine.
Anybody has seen this problem before?
Thank you!

Nicolas

--- In vintagesynthrepair@yahoogroups.com, Philip <eggwheatis@...> wrote:
>
> The original chip is custom programmed during manufacture. You'd have to find one that had actually been pulled working from a Pro-One..
> 
> Basically impossible to find..that's why this guy developed a replacement and whilst doing it added new features.
> 
> 
> ________________________________
>  From: Nicolas <nico678@...>
> To: vintagesynthrepair@yahoogroups.com 
> Sent: Friday, 16 August 2013, 21:20
> Subject: [vintagesynthrepair] Re: Sequential Circuit Pro One  UPD8021 chip
>  
> 
> 
> Â  
> 
> 
> Hi,
> 
> I sent him a message and I think it's the same guy. He's on vacation too. 
> The price is 120$ + shipping which seems a little bit high to me.
> 
> I'd like to find the original chip if it's still possible.
> The number written on the chip is D8021C and it was made by NEC.
> 
> Thank you!
> 
> Nicolas
> 
> --- In vintagesynthrepair@yahoogroups.com, "grantpbt" <grantbt@> wrote:
> >
> > The seller is on vacation, but more info here: www.musictechnologiesgroup.com 
> > 
> > GB
> >
>