Sequential Pro One - Basic Operation; Pro-One Connections Guide

7. Center MASTER TUNE and PITCH wheel and set MOD wheel to minimum (unless
*the wheel cable is disconnected).
8. Adjust VOLUME as required, below.
1-2 KEYBOARD EST
I. Patch according to Figures 1-1 or 1-2. The essential features of these patches are a
fully "open" AMPLIFIER and FILTER, the sawtooth of one oscillator is on, and there is
no modulation.
2. Check that all keys work. Make a note of scratchy, intermittent, or inoperative
keys, Oxidation, particularly of lesser-used keys, can cause keys to go "dead,rt and may
be aggravated by ambient conditions or handling. Check also for contact bounce by
hitting each key hard and repeatedly while listening for break-up or double triggering.
For either condition, cleaning ar careful readjustment of the "J-wirestr is often a1 that
is necessary. After the top panel is removed, the keyboard can be detached from the
bottom panel for cleaning by simply removing four screws. Wipe the contacts carefully
with an alcohol-
or freon-wetted cotton swab. Donqt use any abrasive techniques, as
this will simply remove the gold plating. Replacement J-wires can be ordered as SCI
#S-051.
3. If the keyboard doesn't work at all, check its connector. The GATE LED should light
whenever a key is pressed. If still there is no sound, check Final VCA (para. 1-8).
4. Switch DRONE an. You should hear a continuous tone. The frequency will change as
you play various keys, but the tone itself is not interrupted. Switch DRONE off.
5. Switch REPEATJEXT on. The frequency of the last key played repeats at a rate set
by the LFOJCLOCK FREQUENCY knob. Keys will not be heard when played, but
repeated pitch will change. Switch REPEATIEXT back to NORMAL.
6.. To check or demonstrate low-note priority, hold a key and hit one above it. The
higher key will not sound. Now hold the higher key and hit the lower one. The rower
key sounds when pressed.
5. Switch MODE from NORMAL to RETRIG. Note that this switches from low-note to
last-note priority. The newest key sounds though a lower key may be held.
6. Hold several notes and switch ARPEGGIATE UP, then UP/DOWN to check function.
While arpeggiating, switch up SEQUENCER RECORD and remove hand from keyboard.
The arpeggiator should remain "latched." Switch ARPEGGIATE off.
7. With SEQUENCER RECORD still on, select SEQ 1 and record a sequence. Play it
back. Repeat for SEQ 2.
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