Sequential Pro One - Playing the Pro-One Synthesizer

1-4 OSCILLATOR B lF5T
Figure 1-2
OSC B TEST PATCH
1. Patch according to Figure 1-2.
2. Check that OSC B FREQUENCY knob range exceeds one octave. For reference,
play C2 and remember pitch. Then hold C1 and raise OSC B FREQ. The pitch should
increase smoothly, approaching the reference tone at 7 - 8 on the dial. At 10 the pitch
should be at least a whole step above the reference.
3. Turn OSC B FKEQ to 0. Check OSC B OCTAVE switch by playing C2 and switching
octaves down to 2, 1, and 0. NOTE: When switching octaves with a key depressed, it is
normal to hear the pitch "jump" between octaves.
4. Switch OSC B OCTAVE to 2. Switch OSC 0 SAWTOOTH off. Switch OSC B
TRIANGLE on. The difference between the ''brassy" sawtooth and "dull1' triangle wave
should be obvious. The triangle waveshape has very little harmonic energy. Switch OSC
I3 TRIANGLE off.
5. Switch OSC B PULSE on. Rotate OSC B PULSE WIDTH knob 0 - 10, listening for the
timbral effect of varying harmonics. The pulse will degenerate to dc (or very nearly
dc--99% duty cycle) at the extreme knob settings, resulting in no (or very little) sound.
Find the setting where the second harmonic drops out (50% duty cycle). This normally
occurs between dial markings 5 and 6.
6. Switch OSC B LO FREQ on. Raise 6SC B FREQ to about 6 to more easily hear OSC
B "track" the keyboard at lev$ frequencies. NOTE: he OSC B LO FREQ switch extends
OSC B's FREQ range to sub-audio. It is therefore normal qhat if OSC B FREQUENCY
is set to 10, the LO FREQ switch will appear to have nd effect. Switch 05C B LO
FREQ to NORMAL. /
7. Switch OSC B KYBD off and check that OSC B ceases "tracking" the keyboard.