Roland SPV 355 Synth  (1979) under the hood

2 unit Rackmount , heavy steel case, mono pitch to cv with internal sound generator based on 2 vco oscillator part of the well know  Roland Vocoder and the Dimension D spatial chorus family. Initially designed "as for use with guitars" , it is mainly used for the internal oscillators. See description below for more information,

Just a gallery, not much but verified capacitors and cleaning sliders pots. 

■ the 'P' of the P/V Synth's tname stands for pitch, and the 'V' stands for generated out voltage — main function is to translate an audio signal, from a monophonic instrument e.g a guitar, voice or wind instrument, into note control voltages and trigger capable of playing a  synthesizer with control voltage (1v oct with normal trigger, no strigg) . The SPV355 does the translation and plays relative note-frequency to  the own internal synthesizer.
Not really appreciated for the unreliable guitar translation sluggish and poorly precise.

■ Front panel features and Input (pitch detector) and a three‑way switch for selecting input signal type: Guitar (, Voice or Brass wind . Relative LEDs indicate signal activity to avoid overload — a Threshold control for adjusting the Gate trigger sensitivity to the EG.  It's quite important to set the right amount for correct tracking.

■Two VCOs, a sub‑oscillator, VCF, VCA, envelope generator, two audio router mixers.
The VCO oscillator have over three pitch ranges (4', 8' and 16'), and each VCO is able to generates variable waveforms: Sawtooth, Square and Pulse waves. What's really limit the use as classic synth (they can be controlled by CV gate bypassing the tracker) is that VCOs share same controls for Range, Waveform and Tune.
Second VCO also includes an  footswitch‑controlled A/B tuning function, which makes it possible to set and octave below or upper the VCO1 . VCO1 features and excellent square‑wave sub‑oscillator output (set at relative lower  octave).

■ A footswitch‑controlled variable Portamento glissando is available for both osc but unfortunately this only works with internally tracker and won't work with external signal.

■The VCA is quite simple with a switch to select control via the Envelope Follower or the Envelope Generator.
he Envelope Follower generates a control voltage that follows the amplitude of the input signal as close as possible. Generated CV signal can modulate both  VCF and VCA,
 EG is a simple 3 segments ADS (Attack, Decay, Sustain) type

■ Filter is a LPF a 24dB/octave type with a range of 10Hz‑20kHz with self-oscillation.
Sad enough it's not possible to filter external signal.


■ Dual-voltage controller oscillators
Selectable input source with filtering and level attenuation
Portamento with foot switch control
Three selectable waveforms: Pulse, Square and Sawtooth with three selectable ranges: 4’ , 8’ (unison pitch) and 16’
Offset tuning for VCO #2 with foot switch control to select from two pitch presets
Audio mixer to blend VCO #1, VCO #2 and Sub-Octave outputs
Envelope generator with attack, decay, and sustain
Voltage-controlled filter with resonance, pitch tracking, and variable envelope generator or envelope follow control.
Voltage-controlled amplifier with selectable envelope generator or envelope follow control
Hold pedal input
Variable foot pedal control over filter cutoff of VCO output
CV outputs for Pitch (control voltage), Gate and Envelope Follower
CV inputs for Pitch (control voltage) and Gate
Effects Send

■ Dimensions: 482 (W) x 92 (H) x 350 (D) mm
Power Consumption: 13 watts
Weight: 5.7 kg 

© Copyright - All Rights Reserved
DISCLAMER: We are not affiliated, associated, authorized, endorsed by any musical instrument company

web page templates