Chapter 5: Oscillators and Filters
110 ANDROMEDA A6 REFERENCE MANUAL
DISPLAY
PAGE PANEL LABEL
PARAMETER
DISPLAY
OPTIONS
or RANGE DESCRIPTION
OSC2FM
Continued
—OSC2FM 0 ··· 100 This soft knob sets the amount of FM for the
type(s) selected in the ASSIGN parameter
above. If a combination of two or more types
are assigned, notice that the amounts change
together and by the same amount. Also notice
that this soft knob has the same function as
the OSC 2 FM knob in the OSC 1 section.
Basic Operation
To get started, it’s best if OSC 2 is not heard. You can always mix it in later, but for
now you should turn the OSC 2 knob in the PRE FILTER MIX all the way counter-
clockwise. Also, be sure that SYNC is set of off.
Next, press the VIEW button for OSC 1, then press soft button 4 to select the OSC2FM
page. Using soft knob 4 ASSIGN, select LINEAR as the FM type. If EXPFM and PWM
aren't set to 0.00 already, zero them out using soft knobs 2 and 3 (or by pressing the
▲ and ▼ buttons simultaneously).
As mentioned earlier, the OSC 2 FM knob adjusts the amplitude (amount) of OSC 2
modulating OSC 1. You can also use soft knob 5 for this purpose, or the individual
soft knobs for each type of FM.
Play a key on the A6’s keyboard. As you vary the amount, you will notice significant
changes to the timbre of the sound.
Next, try experimenting with the frequency of OSC 2. First, vary the SEMITONE knob
while playing the same key repeatedly and note the difference in timbre. When you
arrive at a setting that sounds desirable, remember that you can fine-tune this
frequency with the CENTS and FINE knobs.
While you’re working with OSC 2’s tuning, try experimenting with the 1PITCH
parameter. Press OSC 2’s VIEW button, then press soft knob 1 to select the TUNE page if
it’s not already active. Use soft knob 4 to turn 1PITCH on and off. Experiment with
varying the amount of FM as well the tuning controls for OSC 2.
Notice that there’s a MOD button adjacent to the OSC 2 FM knob. This indicates that the
amount of OSC 2 modulating OSC 1 can itself be modulated by any of 79 modulation
sources, which provides for some interesting possibilities.
To FM Modulate OSC 2 by OSC 1
To route OSC 1 to FM OSC 2, press one of OSC 2’s MOD buttons and select OFFSET
ONLY (the first parameter in the list) as the mod SOURCE with soft knob 1. As
described on the next page, select OSC 1 as the NZEXT source. Select EXT -> EXP FM
(the last parameter in the list) as the DEST with soft knob 7 and experiment with
different OFFSET levels.
To FM Modulate a Filter by an Oscillator
The filters can be modulated by the oscillators. In the WAVE page, use soft knob 8 to
set FILTFM to ON for either or both Osc 1 and Osc 2. These sources will appear in
the Filters' CV SOURCE parameters as FILTFM. If Filter 1's CV IN control is up, and
either filter has FILTFM as its CV source, the filter will be modulated.