Total Recall: Modulation section troubleshooting help

[pb1000]

Hi, I built the total recall and biased the chips fine, the delay is working great.   But there is no modulation.  I've done all the normal first troubleshooting steps - voltages check out well, I don't see any bad solder joints.  But there is no modulation.  Can anyone give me some tips of particular sections / parts of the circuit to investigate further?

thanks!

[atodovax]

Where you able to slve this? im having the same problem. No MOD