Schematic
BOM
R1
150K
R2
560K
R3
560K
R4
18K
R5
18K
R6
2K2 (CLR)
R7
Ignore
C1
22n
C2
22n
C3
47p
C4
22n
D1,2
1N4148
D3,4
*
Q1
2n2222
Q2
2n3906
ATTACK
100KB
VOL
100KA
SWITCH
SPDT
*Extra spots have been added for a second set of clipping diodes.
These are optional, but experimentation is fun. Try germaniums or LEDs.
See later in the doc for info about the switching.