Discussion about the Korg PolySix synthesizer

I bought my PolySix a few months ago and had to have the battery and 
IC31 replaced and a few tracks re-wired.  It now sounds fantastic, 
but there are a couple of problems.

First, when I turn it on, there is no sound available except a very 
low-frequency 'bloop'. I have to press the 'Manual' button and 
twiddle a few knobs to start getting a proper sound.  Is this 
normal?  I would have thought it would have some recognisable patch 
on power-up.

Also, the write-to-memory doesn't work well.  If I write a patch, 
then select another patch, then back to the new patch, the sound is 
nothing like what I thought I stored.  Presumably there is another 
chip somewhere that needs to be replaced.  Is this a common problem 
with an easy fix?

Thanks, folks.