flight of harmony PB-1E, Руководство пользователя

Страница: 6 / 8

6/7
Making Noise
The PB filter can also act as a noise generator, and quite a variable
one at that. To do so, just turn the input all the way down (CCW), turn
the gain up a bit, and then adjust the High and Low controls to get the
desired tone of noise. You can get some interesting percussion sounds by
applying an impulse or saw wave to the High CV input, or some nice wind/
whooshing sounds with a slow sweep. Daisy-chaining (series-connecting) a
couple filters makes some nicely creepy ambient effects.
Caveat:
The noise feature is very quiet! I'm talking millivolts here. It
works, trust me, that is the first and last function I test before shipping. If you
can't hear any noise, crank up your output amplifier. If you still can't hear it,
use a preamp as well. It is worth it!
Self-Oscillation
The PB can be made to self-oscillate, turning it into an independent
oscillator. I get a lot of questions about this, so here is the quickest way to
get it working:
Nothing plugged into "Input" 1)
Turn "High" all the way down. 2)
Turn "Gain" all the way up. 3)
Turn "Low" all they way up. 4)
Slowly turn up "High" 5)
As you can see in the
image to the left, the usable range tends
to be between 8:00 and 10:00. It will
start out as a low moaning, then go up
in pitch. The best way to get fine control
over the pitch is by CV control - in the
High to start, but the others will affect it
as well. Once you've figured out how to
start the oscillation, experiment. There
are many variations and ways to obtain
them.
The high, low, and gain all
interact, so there's a lot of possible
combinations.
Don't even ask me about volts/
octave, that's not the point of this thing.
It's a filter, the self-osc is just an added
bonus.
High
Low
Gain
Input
level
CV Signal
High Low In Out
f
(h)
Nominal
self-oscillation
range
Nominal
self-oscillation
range