A further Workshop Bulletin has been added to Piet's Blog at http://www.echotapper.nl/wp.
This is entitled Bulletin 5 Ver 1: Improving FET Gain and Lowering White Noise eTap2hw.
This workaround will improve FET sensitivity and lower output noise significantly, a useful addition to this modification is to use a 470k linear output volume control which allows the unit to match many different amplifiers and recording devices.
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For those considering Automation of the eTap2hw don't forget to checkout Philip Hawthorne's excellent DIY Automation link on Piet's blog.
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Hope you find it useful.
Steve