The instrument
Yamaha's SK-series are combo-keyboards with synthesizer, organ, brass and string sections. The SK 10 was the first of the SK-series, released in 1979. The SK 20, SK 30 and 50D followed in 1980, and the SK-15 in 1981. The SK synthesisers from Yamaha are the successors to the SS 30 Stringmachine.
The SK 30 Symphonie Ensemble Synthesiser combines a 9-voice organ, a polyphonic 7-voice synthesiser, a 7-voice strings section and a monophonic lead synthesiser. Keyboard: 61 keys, C1 - C6, 5 octaves.
The organ section has a full range of stop levers from 16' to 1', as well as 2nd, 3rd and 5th harmonic percussive levers with adjustable decay time.
The poly-synth section is a seven-note polyphonic synthesizer with complete filter and envelope generator controls for creation of an unlimited variety of sounds. With unique touch response functions and a full complement of VCO, VCF, VCA, EG and LFO.
Another feature is the keyboard split function via which different sound sections can be played for ensemble effects. (Yamaha Catalog)
Details
Technical details
Solo synthesiser: LFO 0.1 Hz - 100 Hz; Portamento max. 3 s; Glide max. 70 ms; VCO: foot positions 4′, 5-1/3′, 8′, 16′, 32′, 64′; waveforms: sawtooth, square, pulse width modulation; ADSR: Attack: 0.003 - 3 s, Decay: 0.03 - 30 s, Sustain: 0 - 10; Release: 0.03 - 30 s; CV In: 0.25 V - 2 V; Out: 0.19 V - 3 V; Trigger In/Out; Vibrato for poly and strings section; Delay: 0 - 3.2 s; Speed 5 - 7Hz.
Polysynthesizer: 3 strings sound programmes; polysynth programmes: 3 and manual; slow attack OFF: 3 ms; ON: 80 ms; sustain 0.03 - 1.6 s; brilliance +/- 12db at 5khz; mode I: one tone generator, II: two tone generators;
Foot positions: 4′ sawtooth, 8′ square, 8′ sawtooth, 16′ square, 16′ sawtooth; ADSR: Attack: 0.003 - 3 s; Decay: 0.03 - 30 s; Sustain: 0 - 10; Release: 0.03 - 30 s.
(Source: amazona)