Lap tekst
Sending controller gate & trigger rules:
* The gate is a boolean OR function of all of the keys on the
keyboard. Any or all keys depressed, gate = high, no keys depressed,
gate = low.
* The trigger is a narrow pulse (~10 ms) that is transmitted for
either of the following: 1) the gate goes from low to high, or 2) the
gate is already high but the CV changes because the old note goes away
after a new one is depressed (legato playing).
Note that under these rules you will never see a trigger without a
gate.
Receiving device envelope generator rules:
The trigger starts the attack phase (and the gate is high). When the
attack phase is completed (envelope peak reached) the decay phase
starts. The envelope slopes down to the sustain level for the duration
of the gate. When the gate goes away the envelope slopes down from the
sustain level to zero at the release rate. If the gate goes away
before the attack phase is completed, then the envelope never reaches
peak and slopes to zero at the release rate. If the sustain phase is
in progress and another trigger comes in, the envelope slopes back up
to the peak at the attack rate then decays down to the sustain level.
Notice that Minimoogs don't have triggers as defined above. The
S-trigger that Moogs have is really a gate logically and physically it
is a short across the two pins on the Moog's S-trig input (there are
some who say that "S-trigger" stands for "shorting trigger"). This
means that if you play legato on a Minimoog the envelope won't
retrigger its attack/decay phase until you lift all keys and hit
another one. ARP stuff has gate and trigger and you always get a new
re-trigger of the ADSR when you change notes, legato or staccato. Both
modes are musically useful. Multimoogs have both modes, selectable
with a switch (yay).
Note that if your CV source has both gate and trigger, you don't need
to hook up the trigger if your destination synth doesn't support it. I
think on the ARP stuff that you need a trigger or else the ADSRs will
act funny. If you want to fire an ARP's EG's with just a gate you can
connect the trigger input to the gate with a 0.1uf cap.
A neat trick on some ADSRs that use triggers is to set the VCF EG to
max mod and:
A = short
D = short
S = zero
R = really long
so if you press and hold a key the envelope will go "bwip" but if you
thwak a key for an instant the envelope will rise towards the peak but
jump straight to the release phase and go "baaaaaoooooooowwwwww" so
like you can git two differnt noises outta the same patch!