Doepfer

> I got this module yesterday and is quite everything I expected. Great
> to get the eg's auto triggering each other and create interesting
> patterns.
>
> Question though, how come to get each of the adsr to constantly
> re-trigger itself it has to be patched to 'end of decay'? I thought it
> would work at 'end of release' since thats the last part of the
> envelope no?

I remember that we had the same "problem" in the company during the
development of the A-143-2. Let me try to explain it:
The 'end of release' output is generated by a comparator that compares the
ADSR output to a small voltage (about 100mV). As soon as the ADSR output
becomes lower than this voltage the 'end of release' output turns 'high'.
And the other way round: as soon as the ADSR output becomes higher than this
voltage the 'end of release' output turns back to low level.

If the 'end of release' output is connected to the gate input this happens:
As soon as the ADSR output becomes lower than about 100mV the gate turns
high and the attack phase begins for a very short time. This time is very
short because now the ADSR output voltage increases and reaches the 100mV
very soon (probably less than a millisecond) which causes the 'end of
release' output to turn low which immediately ends the attack phase. With an
oscilloscope you would see a signal that swings very fast around the 100mV
threshold level of the 'end of release' circuit.

If you want to use the 'end of release' output to trigger the gate you need
a circuit that elongates the length of the 'end of release' signal. For
example the A-162 trigger delay (with Delay = Zero) can do this job. The
length of the A-162 defines how long the signal remains high. This time
corresponds to the setting of the attack control of the A-143-2.

I know the explanation is very technical but I hope you will understand the
behaviour of this patch.

Best wishes
Dieter Doepfer