The instrument allows to adjust pitch-bend range (2, 3, and 5 semitones), transposition (+6 / -5 semitones), to deactivate the Auto Power Off function, and to control the simple MIDI implementation: The basic channel is adjustable between 1 and 15 (for Upper tone), the Lower tone always uses the following higher channel. There are 10 Lower tones in ROM, 10 internal and up to 60 Lower tones can be written on the memory card. Lower tones have their own VCF and DCA with identical possibilities like Upper tones. Lower tones have only 16 waves to select, vibrato settings are only on/off and Delay, while the instrument uses the vibrato setting of actually playing an upper tone. In the instrument's memory, there are 20 preset tones, 20 internal tones, which can be re-written by the user, and up to 120 tones can be written on an optional memory card RA-100. #SOUNDSOURCE FOR THE CASIO HT 6000 PATCH#The patch stores the settings of the built-in chorus (off, slow weak, slow deep and fast weak) which influences both Upper and Lower tones. The DCA envelope (again ADSR with adjustable depth) controls not only the amplification of the patch, but also the behavior of SD waves. In single mode, only one filter over all eight voices is available, like on the Korg Poly 800, but the HZ-600 (and aforementioned HT-series instruments) has two filters - the other one is used for Lower tones. The signal goes through a VCF (NJM2090, low-pass 4 pole filter) with adjustable cut-off frequency, resonance (no self-oscillation is achievable) and its own ADSR envelope with adjustable depth. You can adjust its speed, depth, waveform and delay. One LFO is available, controlling vibrato only. Each patch uses 1 oscillator only, and there is no possibility to tune the oscillator one octave lower or upper, and there is no sub oscillator. In the wave memory, there are also classical sawtooth, square and pulse waves, as well as white noise and combined waves. The Spectrum Dynamic (SD) does mean that some of the 32 digitally generated waves (for Upper voice) evolved with time. #SOUNDSOURCE FOR THE CASIO HT 6000 PROFESSIONAL#The only exception in the HT/HZ series is the HT-6000 with more professional features, such as 8 independent filters, 64 waveforms, 4 oscillators per voice, ring modulation and a velocity sensitive keyboard. All these instruments share an identical sound engine. This synth was followed by the HT-3000, a home keyboard-like instrument with programmable automatic accompaniment, 61 standard-size keys and built-in loudspeakers the HT-700 with the same features like HT-3000, but with 49 small keys, and the MT-600, a preset version of the HT-700. The first of the SD instruments was a professional looking bitimbral synthesizer HZ-600. In principle, the SD synthesizers are digital-analog hybrids with eight voices of polyphony. In 1987, Casio released a new Spectrum Dynamic synthesizer on the market.
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