Thats a handy schematic, dont know how I missed that one.
Shorting 11 and 12 to ground will set the current mirror to max, if theres no cap present wont I then get silly freq's, one datasheet I looked at says no cap is allowable if you want the max freq the chip will do.
I was thinking, and I might well be wrong is leave 11 and 12 open setting charge/discharge current to 0, then connect one side of what would have been the cap to + and the other to - through fairly high value r's.
Thanks for that chaps.