4 oscillators on the wall... (fwd)

[Saul Stokes]

Yo!  question.  I just finished building 4 tb-303 oscillators on two
seperate circuit boards. The power supplying these is 15 + going thru a
12+ and then thru a 5+ so that I have 12+ and 5+ to power each little
circuit. My problem is that all individual oscillators work alone but when
you try and use more than one each totally affects the tunning of the
other one (not audio). Coarse tuning one will change the pitch of the
other ones and so on. I put some good sized caps on lines but this doesn't
seem to help.  Any ideas on correcting this? Is this a problem with how
I'm powering them? 

saul