LinPlug Spectral - Manual (Page 96)

Arp Transpose The Transpose value of each step in the Arpeggiator (if
the Arpeggiator is switched On, Bipolar).
Arp Length The Length value of each step in the Arpeggiator (if the
Arpeggiator is switched On, Unipolar).
LFO 1 … LFO 5 The respective LFO. While a LFO is generally bipolar,
it can be switched to certain operation modes (see
LFO section for details) so it appears as a unipolar
source.
Nnn Envelope All Envelopes of Spectral are available as modulation
source. This includes the Oscillator, Filter, the three
dedicated Modulation envelopes (Mod Envelope) and
the Main Envelope.
Modulation Envelopes are not pre-assigned a
destination and only function via the Mod Matrix. All
envelopes are unipolar.
Glide Curve The Glide (sometimes called portamento) Envelope
(unipolar). Keep in mind that this “Envelope” has a
different intensity, depending on the successive notes.
So if you play for example a C3 and then a D3 the
Glide Envelope only has a very small deviation as the
notes are so close. Also, when Glide is set to Constant
Rate mode, the Envelope is shorter or longer
depending on the notes following each other.
Random There are also two random sources: Random Unipolar
and Random Bipolar. This random values stays
constant during the note being played but changes
upon each trigger of a new note. So its different for
each note.
To have a modulation source which is random and
changes while the notes is played, use a LFO with a
random Waveform selected in the LFO section.
Alternate The Alternate modulation source changes between
values of 1 and -1 for each note. This is useful for
modulation effects such as auto-panning (bipolar).
Constant The Modulation Amount is used as a constant
modulation value (unipolar).