Polarity; Pulse Width; Lfo Trigger Modes - Alesis Andromeda A6 Tips And Tricks Manual

Choose an envelope. Instead of modulating something by an LFO, you will be modulating
something by a looping envelope, as follows:
FAST TRIANGLE LFO: Set the envelope attack to 2ms. Set the envelope decay 1 to 2ms and
then drop D2 level to the lowest level. For a triangle LFO, you set the slopes of the envelopes
to linear; you can experiment with various slope rates as well. Now, go to Loop (soft button
5). Set the start at attack, and the end at decay 1. Set the loop type to FORWARD. This will
give you a 250Hz LFO to work with. For a 500Hz LFO, you can try setting the start and end
at attack and set the loop type to ROKROL.
FAST POSITIVE SINE LFO: You can also do a positive-wave sine wave with a looping
envelope. Set the attack speed at 2ms, and the slope as EXP 3. Forget about the rest. Now, go
to Loop. Set the start and end at attack. Set the loop type to FORWARD. Set the looping to
ROKROL.
FAST SAW LFO: Set the envelope attack to 2ms. Set the slopes of the attack to linear. Now,
go to Loop (soft button 5). Set the start at attack, and the end at attach. Set the loop type to
FORWARD. This will give you a 5000Hz saw LFO.
You can modulate envelope stage times to achieve some form of envelope modulation if
desired. (Attack and decay 1 times are modulatable in each envelope' s MOD n directories.)
To calculate looping envelope frequency, perform the following calculation:
1 / (Total milliseconds of envelope / 1000) = n Hz.
Example: 1 / (2 / 1000) = 500 Hz

4.3 polarity:

Don' t forget about the LFO' s polarity! Use soft knob 8 on the main section to adjust the
polarity between positive, negative, and bipolar. The difference depends on the type of
sound you are doing. As you can tell, bipolar will rise and fall below the point of the
modulation that you are setting; positive will only rise; negative will only fall.

4.4 pulse width:

One of the neat things about the Andromeda LFOs is that the pulse width of the LFO shape
can be set. The pulse width controls the difference between the rise rate and the fall rate for
triangle waveforms. This allows for, for instance, different rates of rising and falling to be set
when you are doing a filter sweep via a triangle LFO. On square waveforms it determines
the width of each pulse wave.
Experiment with this function via soft knob 7. It can make a difference in some sounds.

4.5 lfo trigger modes:

Just a reminder:
VOXTRG – If this is set to off, you are forced to choose a trigger source that recycles the LFO
waveform. This could be handy if you want the LFO to start above certain key ranges, etc.