> Another workaround would be to insert any module between the 140 and the
> VCO, that does buffering. A simpe Buffer module might solve this.

Unfortunately there is no workaround solution by using another module
to buffer the ADSR output - I tried (in turn) through a 138, 175 (i.e.
invert twice), and a 129/3, and the problem is clearly still there. It
is caused by the transistor (Q5) which is used to 'switch' between the
decay and sustain phases: basically it doesn't switch off completely,
allowing a very small current to pass through, thus causing the
sustain level to drift downwards over time (I measured about a 0.2V
drop in about 35 secs). If you want a stable sustain level over time,
you cannot do it with an A-140!

Tim

[The views expressed above are entirely those of the writer and do not
represent the views, policy or understanding of any other person or
official body.]