Crumar Spirit - Arpeggiator and Shaper Y; Arpeggiator Modes Explained

MOD X
ARPEGGIATOR
.0.
OFF • • LEAP
RIPPLE ARPEGOIO
The ARPEGGIATOR switch selects one of three arpeggiation modes. In all
modes the keyboard is repeatedly scanned chromatically from bottom-to-top.
Any group of keys depressed is sounded sequentially from lowest to highest.
The sequence is ',wrapped around," or repeated without delay after the
highest key depressed sounds. The speed of this sequence is determined
by the MOD X LFO/S + H RATE control setting - - each note occupies a
clock cycle, or one "blink" of the rate lamp. Synchronous gates from X may
be routed to the Envelope generators (GATE SELECT X ON) for each clock
cycl~, making it possible to determine the envelope of the sound that is
sequenced in pitch.
The RI PPLE mode simply makes a sequence of any keys depressed as descri-
bed.
The ARPEGGIO mode first scans the keyboard and sounds the sequence of
keys depressed. It then repeats the same sequence (given you haven't chan-
ged which keys are depressed) twice; first, one octave higher, than one
octave lower than the original. In other words, the ARPEGGIO mode repeats
the sequence at different octaves.
The LEAP mode changes the octave of notes individually in a sequence.
Each successive
note is either played as held or transposed in this pattern:
(1) played in octave depressed; (2) played one octave higher than depressed;
(3)
played one octave lower than depressed. These three steps are endlessly
repeated.
If you depress three keys it will be easy to hear a pitch/octave
pattern that coincides. When you depress, say a four note chord, you'll hear
the chord members appear in different octaves, and the octave/pitch pattern
will be so long it will be difficult to recognize. That is, octavation is always a
three step pattern; the pitch pattern is determined by how many keys you
depress - - interesting patterns can result.
SHAPER Y
MODE
.0.
F~ •• ~N
rL N1...
KB HOLO RESET
SHAPE
4 A B
RATE
SHAPER Y controls determine shaper output symmetry and rate, and re-
sponse
to keyboard gates.
RATE determines the timing of either the envelope or modulation that the
SHAPER Y section generates. For modulations (when in FREE MODE),
repetition rate may be varied from several cycles per minute (very slow!) to
more than twenty per second. I n the other three (envelope) MODES, the
RATE control varies total envelope rise and fall time.
SHAPE determines the symmetry of the waveform or envelope that is produ-
ced. At "0" the output will have a faster rise than fall; at "5" the output will
be symmetrical; and at "10" the output will have a slow rise and a quick fall.
(See panel graphics). SHAPE does not influence the total time an envelope
will take, or the period of a modulation waveform; but it does determine the
relative percentage of total time that the rise and fall segments will occupy.
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