Drum synthesizer - contruction 2

I've finished the rewiring of the panels, and the drum synth is now working with it's own external 9V DC PSU. Two separate piezo triggers can be used to fire the channels independently, it's a lot of fun. :) Sadly, the DS8's output signals are too quiet, or not ideal for the Wasp VCF, even if resistor R30 (100K) is replaced by a 470K one.

I also need to process external signals, so a preamp will be included:

Preamp, and mixer circuit on veroboard:

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