rj_sleeper
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Because SE oscillators don't really sleep, they can keep awake
subsequent modules unnecessarily. The result is that, for some SE
synths, too many modules are awake, and so the baseline CPU is too
high. rj_sleeper is one approach to improve this: it just copies its
input to its output. Insert it after your oscillators. Connect all
ADSRs that are connected to your VCAs (or equivs) to the Wake pin, and
when they finish (i.e. when there is 0 Volt signal from the summed
ADSRs) and they go to sleep, the rj_sleeper's output will also go to
sleep. This will cascade to subsequent modules.

To figure out whether rj_sleepers might be useful, in your host,
determine whether your CPU usage seems high even when all notes have
finished. Then trace back through the properties panels to see which
modules always have green lights; trace back until, in particular, you
get to an oscillator. That is where the rj_sleeper should be inserted.
Now check the lights again, to verify that you have made the critical
chain sleepy.

Of course, rj_sleeper won't improve CPU performance for playing notes
(actually, it makes it marginally worse) but it can improve CPU for
voices that are not active.

Copy it into Modules/MyModules

Available for unrestricted use. No warranty of quality or fitness for purpose 
made. No promise of maintenance made.