Sequential Pro One - Sequencer Operation

1-7 FILTER TEST
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Figure 1-5
FBLTER TEST PATCH
1. Patch according to Figure 1-5. NOTE: Unless you play staccato or switch to
RETRIG mode, the envelope generator will not retrigger
2, Rotate FILTER CUTOFF knob 0 -
10, listening for sine-wave oscillation. The
superaudia range is encountered at about 7 on the dial.
3. Set FILTER CUTOFF to 3. Raise FILTER KEYBOARD AMOUNT. As this knob is
advanced, the notes heard will approach the diatonic scale tones. With KEYBOARD
AMOUNT set to 8, the scale should be fairly accurate. Leave knob set to 8.
4, Hold a key and rotate FILTER ENVELOPE AMOUNT 0 - 10. This should not detune
the pitch. If it does detune the filter, look into the Filter Envelope Generator circuit
far
the source of the offset. It is normal to hear an increasing transient as you advance
ENVELOPE AMOUNT. This is the voltage peak between the ATTACK and DECAY
periods--which becomes audible because the Envelope Generator is being triggered.
Although the knobs are set to 0, it still takes a finite time to cycle through the
ATTACK and DECAY periods. Leave knob set to 2.
5. Decrease FILTER RESONANCE to the point where oscillation stops and note dial
indication.
It should be between 5 and 6. Return knob to 10.
6. Increase FILTER ATTACK knob to 6. This should give about 1-sec attack time, as
indicated by the pitch which gradually rises then "snaps back" to its starting pitch.
Return to 0.
7. Increase FILTER DECAY knob to 6. This should give abyut 1-sec decay time. Return
knob to 0.
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8, Rotate FILTER SUSTAIN knob 0 - 10. It should smoothly increase filter frequency.
Leave
knob set to 10.