[sdiy] 1Meg log taper pot for ADSR module..

[jpdesroc at oricom.ca]

Hi list,

Here is my question:
I'm building a DIY modular synth using the same type of
Front panels Moog system 55 uses. Now I'm working on
the Envelope Generator module like the 911, I'm drafting the
front panel and would like to use the same
graphics (2msec. To 10sec. ) the 911 module used
for the T1, T2, T3 (Attack, Decay, Release) time potentiometers.
See picture:
http://idecibel.tuxfamily.org/moog900/911.jpg
I'd like to know what is the Brand/model of the 1meg
potentiometer Moog used for adjusting these time durations.
The 911 module T1, T2, T3  pots panel graphics are precises from
2msec to 10sec
(are they really?) Most of the 1meg log pots I found
on the market are +-20% for "1meg and more" values..
The closest pot type I found would be the 
Precision Electronics Components KA1051S28 1meg log.
The Alpha Brand 24mm 1meg log pots I tried
(bought at Mouser.com) are way out 
of the graphical msec/sec front panel marks
(the log curve is not accurate)..

Your help and advices are appreciated.
J-Pierre Desrochers