Sorry if this is rehash, but I couldn't come up with answers to these Q's on my own...
Looks to me like the location and orientation of C14 (4700uF) in the schematic is not the same as it is in the layout. In the scheme, the + side of C14 goes to the + side of C5. But, in the layout it's reversed, the + side of C14 goes to the + side of C4. I can see how it might not make any difference which end of the gain control resistors this cap gets put, but doesn't the orientation matter?
Also, what's the deal with the additional, small caps in parallel with C4, C5, C11, C12? These are in the layout, but not shown in the scheme.
thx!
~ Charlie