Version OS 1.0
7.4.2 FM Synth Operator Description
One of the 4 operators looks like this:
A sine operator is modulated by the outputs of the other 3 sine operators and can
feedback its own output to the other FM operators. A simple Attack/Release envelope
generator can FM-modulate the sine operator as well.
The modulated operator signal is then masked by a final VCA which is controlled by the
A/R envelope generator. The amount determines the volume of this particular operator.
The outputs of the 4 operators are then mixed together and produce the sound of one
voice.
Up to 6 voices can be played. The 6 voices can be
addressed by an external midi keyboard which
plays them polyphonically. The chord is stored in
the preset and is played as a fixed chord by the
internal sequencer according to the maximum
number of voices. This chord is shifted in whole
by the sequence play function SEQ.
See 2
nd
functions 12.9 stereo panning section for
some hidden FM synth settings.
60
ALPHA BASE Operating Manual
Final VCA
Sine Operator
A/R Envelope
+
Output
Other Operators
FM
Amount
One of 6 sample based analog voices
FM
Other Operators
Other Operators
To Other Operators
One of 6 sample based analog voices
+
Voice Output
