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>Tip two > i) power up vortex while holding both 'A/B' and 'reg/preset' >ii) turn preset knob until OB appears, (or OA). >iii) press reg/pre button. >iv) turn reg/pre knob to produce a series of tones >v) parameter knob varies volume > This would seem to be a very high quality sine wave generator, > 125Hz to 16kHz How'd you discover this? -Jesse