Echo Rockit troubleshooting help

[xGx]

Hello there,

I have just finished building an Echo Rockit, but would like some help troubleshooting, if possible.

The main issue is that I can barely hear any output.... if I turn both the Echo Rockit and the amp up to 10 the output is still incredibly soft. The oscillator is inaudible at low frequencies... I am unable to get the nice low sound as in the demo video here: https://youtu.be/0NDlRXwpS1w?t=137

I only (faintly) hear the oscillator at higher frequencies... I don't know if that is a separate problem, or a result of the low amplitude.

Turning the echo volume up helps a little, but not much. However, it does sound as though the echo / delay section is operating correctly.

If I plug my Noise Toaster into the input, I still have trouble hearing anything, although again I can hear the NT coming through, albeit faintly.

So it is possible that everything is working correctly, I just have next to no volume... although it remains to be seen about the oscillator.

I have rechecked the wiring on the panel 4 times, as well as checked and rechecked component placement on the PCB. I have also reflowed my solder joints on the board and panel, and tried replacing all ICs. I have replaced C19 and C20 with film capacitors of equal value (330pf), and also replaced panel mounted capacitor C6 with a film capacitor of equal value (1uF).

I am attaching the relevant documents for convenience, and the project is here: http://musicfromouterspace.com/analogsynth_new/ECHOROCKIT/ECHOROCKIT.php

Anyone have any idea what I should try next? Please let me know if it would help to see any pictures or if you would like me to provide any meter readings. Thanks for the help!

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