Who played a Double Drive?

[Gringo]

Wow people, thank you all for the answers, i guess i'll have to draw a pcb layout to help others as well  

[Nick123]

I  have  built  it  and it sounded quite good.
I still haven't tried it at loud level though.
At bedroom level it sounded grainy at first, but
after some tweaking I managed to get some
really good fat low-gain sounds and good
crunchy rhythm sounds as well.
Sustain is excellent.
It seems that 100klin is better than 100klog for
TONE control because DD sounds a bit dark with
100klog for most of a pot rotation.
100klog for both DRIVE controls are a bit
too clean, but could be good for low gain sounds at
loud level.
With both DRIVE control dimed TL072 as IC2 sounds
horrible, but TLC2262 improves sound a lot.
I have found that DD sound best with
DRIVE A from 5 to 9 , DRIVE AB from 3 to 6 , TONE
from 4 to 8 and LEVEL from 4 to 7.
All pots are still 100klog but I will try 100klin
in TONE and DRIVE positions.
I will install switch for some other diode
arrangements ( 1 LED or 4 Ge diodes for example ).