SOFIA transcendent waveform analog oscillator operator’s manual rev. 1955/1.
module explained SALUT Thank you for purchasing this Xaoc Devices product. Sofia [ˈsɔfja] is a fully analog voltage-controlled oscillator (VCO) based on an original waveforming principle. It features a modern, well-calibrated, temperature compensated triangle core and two elaborate waveshaping and modulating sections. The sound is a mixture of a warm, saturated base tone and two ripple components.
front panel overview 19 base tone spawns a new pair of ripple elements. The ripples’ density and decay rate may be adjusted over a wide range. Additionally, the elements may be warped so that their density accelerates or decelerates within the cycle. Finally, their basic waveform may be switched from sine-like to square-like for additional richness.
6 7 9 8 fig.
range of Sofia extends from about 0.4Hz to 12kHz for the fundamental tone and well into ultrasonic range (over 120 kHz) for the ripple elements. Besides V/Oct control, Sofia also offers two adjustable CV inputs for modulating pitch frequency: pitch fm 4 and global fm 5 with their corresponding attenuators. The main difference between these two is that pitch fm preserves the shape of the waveform, while global fm preserves the overall spectrum, mainly affecting the frequency of the base tone.
1 0.8 Amplitude (V) Amplitude (V) 0.6 0.5 0.4 0.2 0 0 -0.2 -0.5 -0.4 -0.6 Time (μs) -1 0 2000 4000 6000 8000 Time (μs) -0.8 10000 0 2000 4000 6000 8000 10000 fig. 3a: effect of the warp knob turned cw fig. 3b: effect of the warp knob turned ccw The warp knobs 15 affect the ripples’ uniformity during the wave’s fundamental period. In the middle position, the density of the ripple is constant (if not modulated by the ratio parameter).
fof synthesis 1 1 Amplitude (V) Spectrum (dB) 0.5 -10 0 -20 -0.5 -30 Time (μs) -1 0 1000 2000 3000 Harmonic No. -40 40000 0 20 30 40 60 The classic FOF synthesis technique proposed by X. Rodet in the 1980s efficiently synthesizes vocal-like formants in the time domain without resorting to digital filters, which, at the time, were expensive to implement.
MAIN FEATURES WARRANTY TERMS XAOC DEVICES WARRANTS THIS PRODUCT TO BE FREE OF DEFECTS IN MATERIALS OR WORKMANSHIP AND TO CONFORM WITH THE SPECIFICATIONS AT THE TIME OF SHIPMENT FOR ONE YEAR FROM THE DATE OF PURCHASE. DURING THAT PERIOD, ANY MALFUNCTIONING OR DAMAGED UNITS WILL BE REPAIRED, SERVICED, AND CALIBRATED ON A RETURN-TO-FACTORY BASIS.
