if you used liberal substitution in capacitor values would you expect the circuit to not work or just sound different. I obviously know nothing about circuit design, I know the resistors value "balance the circuit" somehow and it will not work if to far off. I do not know if the cap values effect the balance or just the tone.
as an example if I subbed all capacitor to the nearest value to from a Monolithic capacitor value pack
10pf (100)
20pf (200)
22pf (220)
30pf (300)
33pf (330)
47pf (470)
100pf (101)
150pf (151)
200pf (201)
220pf (221)
330pf (331)
470pf (471)
680pf (681)
1nf (102)
2.2nf (222)
3.3nf (332)
4.7nf (472)
10nf (103)
22nf (223)
33nf (333)
47nf (473)
100nf (104)
150nf (154)
220nf (224)
330nf (334)
470nf (474)
1uf (105)
2.2uf (225)
4.7uf (475)
10uf (106)
for something like a big muff
http://1.bp.blogspot.com/-yOZDCUAs2rg/UR_LoOS8TVI/AAAAAAAAE58/rjKREvu3DLo/s1600/EHX+66+Triangle+Big+Muff.pngso 500p would be 470 p, 120n would be 100n, 4n would be either 3.3 of 4.7
would you expect it to work?