memory man, positive supply, doubts

[Dimitree]

hello everyone,
I'm trying to convert a Deluxe Memory Man to +15V instead of -15V since I'll be using BL3208 BBDs, that can be supplied with +9V.
Here is my schematic so far:

http://www.ed-sounds.com/memoryman.pdf

But I have some doubts (circled in the schematic):

1) R15 (top/center on the schematic) should be tied to ground or to +15V? (in the original it goes to ground)
2) the clock cancellation resistors (R21, R26, R32, R35) should go to ground, to +9V or to +15V?
3) VGG of the BBDs should be 14/15 of +V. Is it ok like I wired it now?
4) pin 3 of U3A opamp got the voltage from T4 trimmer (it can be anything between 9V and 0V), is it ok or it would make problems (since that opamp is powered with 15V and not 9V)?
5) any other corrections/suggestions?

many thanks and sorry for my bad english
Dimitri

[Dimitree]

anyone?